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https://github.com/beliavsky/fortrantip

Short instructional Fortran codes associated with Twitter @FortranTip
https://github.com/beliavsky/fortrantip

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Short instructional Fortran codes associated with Twitter @FortranTip

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# FortranTip

Short instructional Fortran codes associated with Twitter [@FortranTip](https://twitter.com/fortrantip) . Search tips and run codes at [FortranTipBrowser](https://zmoon.github.io/FortranTipBrowser/).



### Index of Tweets, Most Recent First, with Associated Code. A List by Topic is [here](https://github.com/Beliavsky/FortranTip/blob/main/topics.md).

[Fortran features in GCC 14](https://twitter.com/fortrantip/status/1791453544911946114) 8:59 AM · May 17, 2024 linking to [Fortran Discourse](https://fortran-lang.discourse.group/t/gcc-14-fortran-features/7984)


[Table of banded linear solvers in Fortran](https://twitter.com/fortrantip/status/1791774218209644782) 6:13 AM · May 18, 2024

linking to [Fortran Discourse](https://fortran-lang.discourse.group/t/banded-solvers-table/8015)


[Fortran ranked 10th on TIOBE](https://twitter.com/fortrantip/status/1787438274421682337) 7:04 AM · May 6, 2024


[Repost: How to use LFortran to compile Fortran codes to WebAssembly via LLVM and host on static web pages](https://twitter.com/lfortranorg/status/1786129003486581025) 4:21 PM · May 2, 2024 linking to [blog post](https://lfortran.org/blog/2024/05/fortran-on-web-using-lfortran/)


[Proceedings of past Cray User Group conferences are available](https://twitter.com/fortrantip/status/1782727490047213998) 7:05 AM · Apr 23, 2024 for example [here](https://cug.org/proceedings/cug2023_proceedings/at_a_glance.html)


[Intel Fortran 2024.1.0 6 is released](https://twitter.com/fortrantip/status/1781108115863224596) 7:50 PM · Apr 18, 2024 linking to [release notes](https://www.intel.com/content/www/us/en/developer/articles/release-notes/oneapi-fortran-compiler-release-notes.html)


[Fortran projects of gha3mi](https://twitter.com/fortrantip/status/1780218918272938452) 8:57 AM · Apr 16, 2024 on [GitHub](https://github.com/gha3mi)


[Fortran Standard Library v0.5.0 is released](https://twitter.com/fortrantip/status/1778757751994237297) 8:11 AM · Apr 12, 2024 linking to [Fortran Discourse](https://fortran-lang.discourse.group/t/fortran-standard-library-release-v0-5-0/7827)


[Fortran for Scientific Computing course at HLRS](https://twitter.com/fortrantip/status/1778568392200368442) 7:38 PM · Apr 11, 2024 -- [course site](https://www.hlrs.de/training/2024/ftn1)


[Intermediate Modern Fortran course by Kevin Stratford](https://twitter.com/fortrantip/status/1777871470837842293) 9:29 PM · Apr 9, 2024 -- [GitHub](https://github.com/ARCHER2-HPC/archer2-fortran-inter)


[New paper "Scheduling and Performance of Asynchronous Tasks in Fortran 2018 with FEATS"](https://twitter.com/fortrantip/status/1774950886474678392) 8:04 PM · Apr 1, 2024 -- [GitHub](https://github.com/sourceryinstitute/FEATS)


[Is Fortran Memory-Safe?](https://twitter.com/fortrantip/status/1773733360742895666) 11:26 AM · Mar 29, 2024 -- [Fortran Discourse](https://fortran-lang.discourse.group/t/is-fortran-memory-safe/7716/21)


[For REAL x and COMPLEX z, x = z%re is clearer than x = z](https://twitter.com/fortrantip/status/1771496228359942251) 7:16 AM · Mar 23, 2024


[Production code should not use parameterized derived types](https://twitter.com/fortrantip/status/1770952019072758008) 7:13 PM · Mar 21, 2024 -- [Fortran Discourse](https://fortran-lang.discourse.group/t/pdt-memory-footprint/7666)


[Fortran literal constant cannot have a minus sign](https://twitter.com/fortrantip/status/1768438191051186418) 8:44 PM · Mar 14, 2024


[By creating a namelist string from GET_COMMAND() you can parse command line arguments](https://twitter.com/fortrantip/status/1764616927186407757) 6:40 AM · Mar 4, 2024 -- [GitHub](https://github.com/urbanjost/M_CLI)


[Namelists blog post by Antoine Dauptain](https://twitter.com/fortrantip/status/1764262409554817283) 7:11 AM · Mar 3, 2024


[Installing gfortran on Windows](https://twitter.com/fortrantip/status/1763893232847450118) 6:44 AM · Mar 2, 2024


[Overloading of asterisk (*) -- post by John Harper](https://twitter.com/fortrantip/status/1763564291456684077) 8:57 AM · Mar 1, 2024


[Special meaning of asterisk (*) in DATA, READ, and NAMELIST](https://twitter.com/fortrantip/status/1763118013086126234) 3:24 AM · Feb 29, 2024


[Variables set in a DATA statement have the SAVE attribute](https://twitter.com/fortrantip/status/1762805946684752059) 6:44 AM · Feb 28, 2024


[DATA statement should be placed just after declarations](https://twitter.com/fortrantip/status/1762311744523800640) 10:00 PM · Feb 26, 2024


[New preprint "Accelerating Fortran Codes: A Method for Integrating Coarray Fortran with Cuda Fortran and Openmp"](https://twitter.com/fortrantip/status/1761873094212260275) 4:57 PM · Feb 25, 2024


[CHARACTER (len=*) and * in declarations of named constant arrays](https://twitter.com/fortrantip/status/1761163705524396432) 5:58 PM · Feb 23, 2024


[Use unformatted stream I/O to quickly and exactly store data.](https://twitter.com/fortrantip/status/1745778303443628049) 7:02 AM · Jan 12, 2024 [unformatted_stream.f90](./unformatted_stream.f90)


[Declare and set quadruple precision variables in a standard-conforming way by setting a KIND](https://twitter.com/fortrantip/status/1739252899589308855) 6:52 AM · Dec 25, 2023 [quad.f90](./quad.f90)


[Fortran 2023 Standard and Interpretation Document](https://twitter.com/fortrantip/status/1738915596111089790) 8:32 AM · Dec 24, 2023


[Access comp.lang.fortran and other Usenet groups with Nemoweb](https://twitter.com/fortrantip/status/1738600402679947765) 11:40 AM · Dec 23, 2023


[Fortls is a language server for Fortran that interfaces with a code editor](https://twitter.com/fortrantip/status/1738185420590944609) 8:11 AM · Dec 22, 2023


[Link to talk on Using the HPE Cray Programming Environment to Port and Optimize (Fortran) Applications to a GPU environment](https://twitter.com/fortrantip/status/1737440975520252190) 6:53 AM · Dec 20, 2023


[Physical constants are available from the NIST codata project](https://twitter.com/fortrantip/status/1737086403379429583) 7:24 AM · Dec 19, 2023


[Fast_math is a library of functions for summation, trig, log, and sqrt that is faster and more accurate than the compiler intrinsics on some platforms.](https://twitter.com/fortrantip/status/1736736771696697514) 8:14 AM · Dec 18, 2023


[Feq-parse allows you to define functions as character strings and evaluate them on-the-fly.](https://twitter.com/fortrantip/status/1736368423762882948) 7:51 AM · Dec 17, 2023


[Fortran-shlex ports the Python’s shlex shell-like lexer.](https://twitter.com/fortrantip/status/1735982360582053959) 6:17 AM · Dec 16, 2023


[Brad Richardson's videos on Fortran 2023 and other topics](https://twitter.com/fortrantip/status/1735663680040177930) 9:10 AM · Dec 15, 2023


[Fortran is ranked 12th in the December Tiobe programming language index](https://twitter.com/fortrantip/status/1734541344004092319) 6:50 AM · Dec 12, 2023


[Test-drive from @fortranlang and other unit testing frameworks](https://twitter.com/fortrantip/status/1734170647507398814) 6:17 AM · Dec 11, 2023


[Fortran testing "unframework"](https://twitter.com/fortrantip/status/1734169716766171416) 6:14 AM · Dec 11, 2023


[Ifx is now the flagship Intel Fortran compiler, replacing ifort.](https://twitter.com/fortrantip/status/1733813564001997133) 6:39 AM · Dec 10, 2023


[PlusFORT 8, a suite of tools for analyzing and improving Fortran programs, is free for noncommercial use](https://twitter.com/fortrantip/status/1733453265117831675) 6:47 AM · Dec 9, 2023


[Modern Fortran Explained: Incorporating Fortran 2023 published](https://twitter.com/fortrantip/status/1733157239085535252) 11:11 AM · Dec 8, 2023


[Use the optional KIND argument of SIZE, MINLOC, FINDLOC etc. for large arrays.](https://twitter.com/fortrantip/status/1534178812501577731) 10:21 AM · Jun 7, 2022 [size_test.f90](./size_test.f90)


[With sequence association, the shapes of the actual and dummy arguments need not match.](https://twitter.com/fortrantip/status/1532039979723022337) 12:42 PM · Jun 1, 2022 [print_mat.f90](./print_mat.f90)


[Sequence association effectively lets you pass a pointer to an array element.](https://twitter.com/fortrantip/status/1531621102879133696) 8:58 AM · May 31, 2022


[Wrap a procedure with explicit shape array arguments in a procedure with an assumed shape arguments for safety.](https://twitter.com/fortrantip/status/1531620667220709377) 8:56 AM · May 31, 2022 [wrap_explicit_shape.f90](./wrap_explicit_shape.f90)


[Special meanings of * and / in list-directed input](https://twitter.com/fortrantip/status/1529807207080009729) 8:50 AM · May 26, 2022 [list_directed_read.f90](./list_directed_read.f90)


[Ways of declaring character variables](https://twitter.com/fortrantip/status/1529412759351336960) 6:43 AM · May 25, 2022


[List of books with Fortran code other than Fortran textbooks.](https://twitter.com/fortrantip/status/1528326631043088384) 6:47 AM · May 22, 2022


[C can call Fortran procedures with prototypes generated by gfortran -fc-prototypes.](https://twitter.com/fortrantip/status/1527982071943159809) 7:58 AM · May 21, 2022 [call_print_stats.c](./call_print_stats.c) [print_stats.f90](./print_stats.f90)


[An omitted Fortran optional argument corresponds to a NULL argument of a C function.](https://twitter.com/fortrantip/status/1527632181983645696) 8:47 AM · May 20, 2022 [xstrtof.f90](./xstrtof.f90)


[Use c_funloc() to pass a Fortran function as an argument to a C function.](https://twitter.com/fortrantip/status/1527249982692245510) 7:29 AM · May 19, 2022 [c_func_ptr.f90](./c_func_ptr.f90) [cfuncptr.c](./cfuncptr.c) 


[Use valgrind to find memory leaks in programs that use pointers.](https://twitter.com/fortrantip/status/1526882686467448833) 7:09 AM · May 18, 2022 [leak.f90](./leak.f90)


[Use TYPE(C_PTR) and C_F_POINTER to call a C function returning a pointer.](https://twitter.com/fortrantip/status/1526575755903246336) 10:49 AM · May 17, 2022 [c_f_pointer.f90](./c_f_pointer.f90) [squares.c](./squares.c) 


[An allocated allocatable array can be passed to C as an explicit-shape array.](https://twitter.com/fortrantip/status/1526179041652486147) 8:33 AM · May 16, 2022 [xscale.f90](./xscale.f90) [scale_vec.c](./scale_vec.c)


[Common block and module variables with bind(c) can be accessed from C.](https://twitter.com/fortrantip/status/1525817060856561667) 8:35 AM · May 15, 2022 [xcircle.f90](./xcircle.f90) [circle.c](./circle.c)


[Fortran array x(n1,n2) passed to C array x[n2][n1]](https://twitter.com/fortrantip/status/1525473581492314112) 9:50 AM · May 14, 2022 [xcol_sum.f90](./xcol_sum.f90) [sum_rows.c](./sum_rows.c)


[Use the std::span container from C++ 20 to view a contiguous Fortran array with a STL-compatible interface.](https://twitter.com/fortrantip/status/1524730212176564230) 8:36 AM · May 12, 2022 [test_sort.f90](./test_sort.f90) [sort.cpp](./sort.cpp)


[C++ functions can be called from Fortran if they are declared extern "C" and have C-like arguments.](https://twitter.com/fortrantip/status/1523289035900276736) 9:09 AM · May 8, 2022 [xnormal.f90](./xnormal.f90) [normal_array.cpp](./normal_array.cpp)


[The Fortran name can differ from the C name of a function if the NAME attribute appears in BIND.](https://twitter.com/fortrantip/status/1522907590048587776) 7:53 AM · May 7, 2022 [printf.f90](./printf.f90)


[A simple derived type with the BIND(C) attribute interoperates with a C struct.](https://twitter.com/fortrantip/status/1522553330282778625) 8:26 AM · May 6, 2022


[Non-pointer arguments of C functions should have the VALUE attribute in the Fortran interface.](https://twitter.com/fortrantip/status/1522208519096836096) 9:36 AM · May 5, 2022 [xsum_vec.f90](./xsum_vec.f90) [sum_vec.c](./sum_vec.c)


[C library functions can be called if an INTERFACE is provided.](https://twitter.com/fortrantip/status/1521921486302363656) 2:35 PM · May 4, 2022 [atoi_vs_read.f90](./atoi_vs_read.f90)


[Fortran 2003 standardized the interoperation of Fortran and C.](https://twitter.com/fortrantip/status/1521476255165698051) 9:06 AM · May 3, 2022


[Use compiler options to catch the use of uninitialized variables.](https://twitter.com/fortrantip/status/1521100997195669504) 8:15 AM · May 2, 2022


[B, O, Z edit descriptors can be used to print integers as binary, octal, or hexadecimal.](https://twitter.com/fortrantip/status/1520746070829158400) 8:44 AM · May 1, 2022 [boz.f90](./boz.f90)


[Use IANY instead of nested IOR, IALL instead of nested IAND.](https://twitter.com/fortrantip/status/1520241782038007808) 11:21 PM · Apr 29, 2022 [iany.f90](./iany.f90)


[When is the -ffast-math option safe?](https://fortran-lang.discourse.group/t/can-one-design-coding-rules-to-follow-so-that-ffast-math-is-safe/2762) 7:14 AM · Apr 29, 2022


[Use ifort -fast or gfortran -O3 -march=native for speed.](https://twitter.com/fortrantip/status/1519634828265762816) 7:09 AM · Apr 28, 2022


[Compilers may accept extensions by default but have options to flag non-standard code.](https://twitter.com/fortrantip/status/1518923088599162880) 8:00 AM · Apr 26, 2022


[Compiler Explorer shows the assembly code generated by many Fortran compilers.](https://twitter.com/fortrantip/status/1518552648647168001) 7:28 AM · Apr 25, 2022


[Fortran-lang has a section on Building Programs, and F18 has a compiler options comparison.](https://twitter.com/fortrantip/status/1517857866757124099) 9:28 AM · Apr 23, 2022


[Fortran Package Manger simplifies building programs.](https://twitter.com/fortrantip/status/1517462836062081024) 7:18 AM · Apr 22, 2022


[Compilation can fail if there is no main program or if a USEd module has not been compiled.](https://twitter.com/fortrantip/status/1517106458281844736) 7:42 AM · Apr 21, 2022


[Create an executable in one step by compiling all source files or by compiling source files with -c and linking the object files.](https://twitter.com/fortrantip/status/1517106070614941697) 7:40 AM · Apr 21, 2022


[NOT, IAND, IOR, and IEOR perform logical operations on the bit representations of integers.](https://twitter.com/fortrantip/status/1516749872019431432) 8:05 AM · Apr 20, 2022 [bit_func.f90](./bit_func.f90)


[TRANSFER can be used to store one type in another type.](https://twitter.com/fortrantip/status/1516389389189984265) 8:12 AM · Apr 19, 2022 [transfer.f90](./transfer.f90)


[Use PACK to select records from an array of derived types.](https://twitter.com/fortrantip/status/1516024155698872329) 8:01 AM · Apr 18, 2022 [query.f90](./query.f90)


[Fortran codes are listed by topic at the fortran-lang package index and Fortran Code on GitHub](https://twitter.com/fortrantip/status/1515656659292598277) 7:41 AM · Apr 17, 2022


[Implied do loop can access arbitrary derived type array sections.](https://twitter.com/fortrantip/status/1515301634280148995) 8:10 AM · Apr 16, 2022 [derived_type_implied_do.f90](./derived_type_implied_do.f90)


[Derived type array sections are allowed before or after the % component selector, but not in both places.](https://twitter.com/fortrantip/status/1514939755892510727) 8:12 AM · Apr 15, 2022 [derived_type_section.f90](./derived_type_section.f90)


[Serialize a derived type using unformatted stream I/O.](https://twitter.com/fortrantip/status/1514587088393494528) 8:51 AM · Apr 14, 2022 [dt_stream.f90](./dt_stream.f90)


[PDT can have fixed parameters at compile time or be ALLOCATABLE.](https://twitter.com/fortrantip/status/1514220538071244804) 8:34 AM · Apr 13, 2022


[PDT can have array dimension, KIND, and character LEN parameters.](https://twitter.com/fortrantip/status/1514220328846831625) 8:33 AM · Apr 13, 2022 [pdt_matrix.f90](./pdt_matrix.f90)


[Links to tutorials on parameterized derived types (PDT).](https://twitter.com/fortrantip/status/1513863460706308096) 8:55 AM · Apr 12, 2022


[Deallocating a derived type deallocates its allocatable components.](https://twitter.com/fortrantip/status/1513501493382496259) 8:57 AM · Apr 11, 2022 [alloc_dt.f90](./alloc_dt.f90)


[MOVE_ALLOC may be faster than RESHAPE or allocation on asignment to resize an array.](https://twitter.com/fortrantip/status/1513125862916382720) 8:04 AM · Apr 10, 2022 [move_alloc_bench.f90](./move_alloc_bench.f90)


[Use MOVE_ALLOC to resize an array.](https://twitter.com/fortrantip/status/1513111554107006979) 7:08 AM · Apr 10, 2022 [move_alloc.f90](./move_alloc.f90)


[If unsure, test whether a variable is ALLOCATED before using DEALLOCATE.](https://twitter.com/fortrantip/status/1512757635291963395) 7:41 AM · Apr 9, 2022


[ALLOCATE has an optional ERRMSG specifier.](https://twitter.com/fortrantip/status/1512395017473736704) 7:40 AM · Apr 8, 2022 [alloc_errmsg.f90](./alloc_errmsg.f90)


[ASSOCIATE to an array-valued expression allocates an array.](https://twitter.com/fortrantip/status/1512020145853673478) 6:51 AM · Apr 7, 2022


[ALLOCATE with SOURCE or MOLD to set values or SHAPE.](https://twitter.com/fortrantip/status/1512018397734838274) 6:44 AM · Apr 7, 2022 [alloc_source_mold.f90](./alloc_source_mold.f90)


[Place IMPLICIT NONE before CONTAINS in a module.](https://twitter.com/fortrantip/status/1511683238212816903) 8:32 AM · Apr 6, 2022


[Scratch files are unnamed temporary files for I/O.](https://twitter.com/fortrantip/status/1511318331659325445) 8:22 AM · Apr 5, 2022 [scratch.f90](./scratch.f90)


[Read a file into a string with unformatted stream.](https://twitter.com/fortrantip/status/1510940360582782976) 7:20 AM · Apr 4, 2022 [file_to_string.f90](./file_to_string.f90)


[Because recursive I/O is prohibited, a function should use ERROR STOP msg instead of PRINT statements for error messages.](https://twitter.com/fortrantip/status/1510585396467535879) 7:49 AM · Apr 3, 2022 [recursive_io.f90](./recursive_io.f90)


[Use an implied do loop with a dummy variable to skip fields when reading a file.](https://twitter.com/fortrantip/status/1510212760201830401) 7:09 AM · Apr 2, 2022 [skip_columns.f90](./skip_columns.f90)


[List-directed READ will use several lines if necessary.](https://twitter.com/fortrantip/status/1509858203227545602) 7:40 AM · Apr 1, 2022 [list_directed.f90](./list_directed.f90)


[MOOC on "Defensive programming and debugging"](https://twitter.com/fortrantip/status/1509557710810980358) 11:46 AM · Mar 31, 2022


[Use the "(a)" format to read a line of a file into a string.](https://twitter.com/fortrantip/status/1509493654678876166) 7:31 AM · Mar 31, 2022 [read_line.f90](./read_line.f90)


[Error in READ statement causes all variables to become undefined.](https://twitter.com/fortrantip/status/1509144120404676611) 8:22 AM · Mar 30, 2022 [read_err.f90](./read_err.f90)


[Use an implied do loop with TRIM to print an array of character variables without trailing blanks.](https://twitter.com/fortrantip/status/1508769980313124870) 7:36 AM · Mar 29, 2022 [trim_loop.f90](./trim_loop.f90)


[print*,char(7) causes the program to beep.](https://twitter.com/fortrantip/status/1508401513445605379) 7:12 AM · Mar 28, 2022


[DO WHILE loop iterates as long as condition at beginning is met.](https://twitter.com/fortrantip/status/1508040660124848129) 7:18 AM · Mar 27, 2022 [do_while.f90](./do_while.f90)


[Invalid loop bounds were discussed at Fortran Discourse.](https://twitter.com/fortrantip/status/1507673746965946368) 7:00 AM · Mar 26, 2022


[Beware of a loop to huge(i), since huge(i)+1 is out of range.](https://twitter.com/fortrantip/status/1507669898486501381) 6:44 AM · Mar 26, 2022 [huge_loop.f90](./huge_loop.f90)


[Number of iterations in a loop is determined at the beginning.](https://twitter.com/fortrantip/status/1507323239151906819) 7:47 AM · Mar 25, 2022 [loop_bound.f90](./loop_bound.f90)


[Changing a loop index within a loop is invalid.](https://twitter.com/fortrantip/status/1506976258411872268) 8:48 AM · Mar 24, 2022 [loop_index.f90](./loop_index.f90)


[CYCLE skips the remaining statements in a loop.](https://twitter.com/fortrantip/status/1506603320361857026) 8:06 AM · Mar 23, 2022 [cycle.f90](./cycle.f90)


[EXIT can be used to leave a named outer loop.](https://twitter.com/fortrantip/status/1506235487782113282) 7:44 AM · Mar 22, 2022 [loop_label.f90](./loop_label.f90)


[Use REWIND and BACKSPACE to change file position.](https://twitter.com/fortrantip/status/1505877382716170245) 8:02 AM · Mar 21, 2022 [rewind.f90](./rewind.f90)


[Slash / terminates a record.](https://twitter.com/fortrantip/status/1505555510262697987) 10:43 AM · Mar 20, 2022 [slash.f90](./slash.f90)


[Stream input/output article by Clive Page](https://twitter.com/fortrantip/status/1505153106228690946) 8:03 AM · Mar 19, 2022


[Specific array elements can read or written to unformatted stream file by specifying the POS.](https://twitter.com/fortrantip/status/1505150360851210241) 7:53 AM · Mar 19, 2022 [stream_pos_dt.f90](./stream_pos_dt.f90)


[DIRECT access file allows access to arbitrary record without looping over the previous records.](https://twitter.com/fortrantip/status/1504793375765155840) 8:14 AM · Mar 18, 2022 [direct_access.f90](./direct_access.f90)


[How to append to a file or delete it](https://twitter.com/fortrantip/status/1504422788517576704) 7:41 AM · Mar 17, 2022 [write_append.f90](./write_append.f90)


[Use INQUIRE to get unit and file properties.](https://twitter.com/fortrantip/status/1504067234326528000) 8:09 AM · Mar 16, 2022 [inquire.f90](./inquire.f90)


[Use NEWUNIT in OPEN to get an unused unit number.](https://twitter.com/fortrantip/status/1503700530496946177) 7:51 AM · Mar 15, 2022 [newunit.f90](./newunit.f90)


[Number of files open simultaneously is limited, so they should be closed when possible.](https://twitter.com/fortrantip/status/1503339726534852615) 7:58 AM · Mar 14, 2022 [open_units_limit.f90](./open_units_limit.f90)


[Write to many files by creating file names with internal write.](https://twitter.com/fortrantip/status/1503015109354045442) 10:28 AM · Mar 13, 2022 [write_many_files.f90](./write_many_files.f90)


[Unit n is connected to fort.n by default for most compilers.](https://twitter.com/fortrantip/status/1502625494499536904) 7:40 AM · Mar 12, 2022 [implicitly_connected.f90](./implicitly_connected.f90)


[Connect INPUT_UNIT and OUTPUT_UNIT to files to redirect standard input and output.](https://twitter.com/fortrantip/status/1502277940066893835) 8:39 AM · Mar 11, 2022 [output_unit.f90](./output_unit.f90)


[Use ALLOCATABLE arrays or ASSOCIATE instead of POINTER when possible.](https://twitter.com/fortrantip/status/1501898993785319429) 7:33 AM · Mar 10, 2022


[Pointer should be initialized to null() to avoid undefined association status.](https://twitter.com/fortrantip/status/1501547568307728385) 8:16 AM · Mar 9, 2022 [pointer_use.f90](./pointer_use.f90)


[Pointer can remap array shape and bounds.](https://twitter.com/fortrantip/status/1501169574997377025) 7:14 AM · Mar 8, 2022 [pointer_reshape.f90](./pointer_reshape.f90)


[Bounds of associate-name for whole array or array section selector](https://twitter.com/fortrantip/status/1500813206356430848) 7:38 AM · Mar 7, 2022 [associate_bounds.f90](./associate_bounds.f90)


[Tips by topic](https://twitter.com/fortrantip/status/1500472144878313473) 9:03 AM · Mar 6, 2022


[A variable ASSOCIATEd to an ALLOCATABLE variable is not ALLOCATABLE.](https://twitter.com/fortrantip/status/1500448694734364675) 7:30 AM · Mar 6, 2022 [associate_alloc.f90](./associate_alloc.f90)


[ASSOCIATE statement can set several independent variables.](https://twitter.com/fortrantip/status/1500087163668549636) 7:33 AM · Mar 5, 2022 [associate_many.f90](./associate_many.f90)


[ASSOCIATE is preferred over POINTER to create an alias because POINTER can inhibit optimization.](https://twitter.com/fortrantip/status/1499720499181535247) 7:16 AM · Mar 4, 2022 [associate_vs_pointer.f90](./associate_vs_pointer.f90)


[Pointer assignment and ASSOCIATE can create shallow copies.](https://twitter.com/fortrantip/status/1499368960151760896) 7:59 AM · Mar 3, 2022 [copy.f90](./copy.f90)


[Internal procedures have access to variables from the host unless they are overridden by local variables.](https://twitter.com/fortrantip/status/1499014126265372685) 8:29 AM · Mar 2, 2022 [scope.f90](./scope.f90)


[BLOCK construct allows declarations after executable statements.](https://twitter.com/fortrantip/status/1498646417778548736) 8:08 AM · Mar 1, 2022 [block.f90](./block.f90)


[Five free C C++ Fortran compiler families](https://twitter.com/fortrantip/status/1498291406556876806) 8:38 AM · Feb 28, 2022


[Errors in a procedure can be handled with an optional argument.](https://twitter.com/fortrantip/status/1497902611915284482) 6:53 AM · Feb 27, 2022 [optional_err.f90](./optional_err.f90)


[Check that assumed-shape array arguments have consistent dimensions.](https://twitter.com/fortrantip/status/1497562564334694401) 8:21 AM · Feb 26, 2022 [error_handling.f90](./error_handling.f90)


[ERROR STOP vs. STOP.](https://twitter.com/fortrantip/status/1497181532146089985) 7:07 AM · Feb 25, 2022 [error_stop.f90](./error_stop.f90)


[Assumed type arguments have no declared type.](https://twitter.com/fortrantip/status/1496825853551992843) 7:34 AM · Feb 24, 2022 [assumed_type.f90](./assumed_type.f90)


[Unlimited polymorphic pointer can point to any type.](https://twitter.com/fortrantip/status/1496470666576642048) 8:03 AM · Feb 23, 2022 [unlimited_pointer.f90](./unlimited_pointer.f90)


[Unlimited polymorphic allocatable variable can be set to any type.](https://twitter.com/fortrantip/status/1496463950375960579) 7:36 AM · Feb 23, 2022 [unlimited_poly.f90](./unlimited_poly.f90)


[Fortran 2018 procedures can have assumed-rank arguments.](https://twitter.com/fortrantip/status/1496107321457528835) 7:59 AM · Feb 22, 2022 [assumed_rank.f90](./assumed_rank.f90)


[storage_size(A) returns the storage size of argument A in bits.](https://twitter.com/fortrantip/status/1495738404356689926) 7:33 AM · Feb 21, 2022 [storage_size.f90](./storage_size.f90)


[A derived type can have PRIVATE components.](https://twitter.com/fortrantip/status/1495372934537428997) 7:21 AM · Feb 20, 2022 [dt_private.f90](./dt_private.f90)


[A derived type component can have a default value.](https://twitter.com/fortrantip/status/1495001410894811139) 6:44 AM · Feb 19, 2022 [type_constructor_optional.f90](./type_constructor_optional.f90)


[A derived type can have derived type components.](https://twitter.com/fortrantip/status/1494651022010200065) 7:32 AM · Feb 18, 2022 [derived_type_composition.f90](./derived_type_composition.f90)


[A derived type can be used where a scalar is needed.](https://twitter.com/fortrantip/status/1494295438320713730) 7:59 AM · Feb 17, 2022 [elemental_func_arg.f90](./elemental_func_arg.f90)


[Modern Fortran Reference Card and Quick Reference/Cheat Sheet.](https://twitter.com/fortrantip/status/1493920435997659145) 7:09 AM · Feb 16, 2022


[Bounds of an allocatable array are preserved when passed to an allocatable, intent(in) or intent(in out) argument.](https://twitter.com/fortrantip/status/1493569929668354051) 7:56 AM · Feb 15, 2022 [allocatable_bounds.f90](./allocatable_bounds.f90)


[Bounds of a derived type array component are preserved when passed to procedure.](https://twitter.com/fortrantip/status/1493214664754438149) 8:24 AM · Feb 14, 2022 [lbound_assumed_shape.f90](./lbound_assumed_shape.f90)


[Array lower bounds are not preserved when passed as assumed shape argument.](https://twitter.com/fortrantip/status/1493207320184164352) 7:55 AM · Feb 14, 2022 [lbound_assumed_shape.f90](./lbound_assumed_shape.f90)


[How to reverse an array or character string](https://twitter.com/fortrantip/status/1492844114492243971) 7:52 AM · Feb 13, 2022 [reverse.f90](./reverse.f90)


[Character variables can be compared like numerical variables.](https://twitter.com/fortrantip/status/1492489511821004805) 8:23 AM · Feb 12, 2022 [compare_character.f90](./compare_character.f90)


[Internal write to character variable too small to hold output causes run-time error.](https://twitter.com/fortrantip/status/1492114908351283206) 7:34 AM · Feb 11, 2022 [write_char.f90](./write_char.f90)


[Convert from strings to numbers and the reverse using internal READ and WRITE.](https://twitter.com/fortrantip/status/1491754652030885888) 7:43 AM · Feb 10, 2022 [internal_read_write.f90](./internal_read_write.f90)


[spread(source, dim, ncopies) copies a SOURCE array NCOPIES times along dimension DIM.](https://twitter.com/fortrantip/status/1491380119616700417) 6:55 AM · Feb 9, 2022 [spread.f90](./spread.f90)


[Concatenate arrays and scalars in an array constructor []](https://twitter.com/fortrantip/status/1491021968799600641) 7:11 AM · Feb 8, 2022 [concatenate.f90](./concatenate.f90)


[get_command() and get_command_argument() get command line arguments.](https://twitter.com/fortrantip/status/1490666160504905730) 7:38 AM · Feb 7, 2022 [get_command.f90](./get_command.f90)


[Demonstrate subroutine get_environment_variable(name,value) of Fortran 2003.](https://twitter.com/fortrantip/status/1490329749578731530) 9:21 AM · Feb 6, 2022 [get_env.f90](./get_env.f90)


[Document results with compiler_version(), compiler_options(), and other intrinsics.](https://twitter.com/fortrantip/status/1489952805649588226) 8:23 AM · Feb 5, 2022 [xpi.f90](./xpi.f90)


[Execute_command_line() can call gnuplot to display a plot during a run.](https://twitter.com/fortrantip/status/1489580579653918729) 7:44 AM · Feb 4, 2022


[Execute_command_line() to pass a command to the shell.](https://twitter.com/fortrantip/status/1489212898777964545) 7:23 AM · Feb 3, 2022 [execute.f90](./execute.f90)


[Mistakes in Fortran 90 Programs That Might Surprise You, by Szymanski](https://twitter.com/fortrantip/status/1488844789575569408) 7:00 AM · Feb 2, 2022


[Setting the values of an array section](https://twitter.com/fortrantip/status/1488492649166295043) 7:41 AM · Feb 1, 2022 [truloc.f90](./truloc.f90)


[Vector subscript can be used for non-contiguous array sections.](https://twitter.com/fortrantip/status/1488132722761609216) 7:51 AM · Jan 31, 2022 [vector_subscript.f90](./vector_subscript.f90)


[Polyhedron suggested compiler optimization options and Fortran 95 benchmarks](https://twitter.com/fortrantip/status/1487791193710866437) 9:13 AM · Jan 30, 2022


[Google foo filetype:f90 or foo filetype:f to find Fortran code with foo.](https://twitter.com/fortrantip/status/1487557071818084357) 5:43 PM · Jan 29, 2022


[A procedure can have an argument that is another PROCEDURE with an INTERFACE.](https://twitter.com/fortrantip/status/1487410814919356419) 8:02 AM · Jan 29, 2022 [trapezoid.f90](./trapezoid.f90)


[Call ieee_set_halting_mode() to set floating point conditions that halt program.](https://twitter.com/fortrantip/status/1487084606780325889) 10:26 AM · Jan 28, 2022 [ieee_exceptions.f90](./ieee_exceptions.f90)


[IEEE_ARITHMETIC module has functions to test numerical conditions.](https://twitter.com/fortrantip/status/1486706121335263246) 9:22 AM · Jan 27, 2022 [ieee_arithmetic.f90](./ieee_arithmetic.f90)


[Dummy argument that is changed must be definable in the caller.](https://twitter.com/fortrantip/status/1486313053092208645) 7:20 AM · Jan 26, 2022 [definable_arg.f90](./definable_arg.f90)


[ALLOCATABLE INTENT(OUT) argument is deallocated.](https://twitter.com/fortrantip/status/1485957543990018053) 7:47 AM · Jan 25, 2022 [intent_out_allocatable.f90](./intent_out_allocatable.f90)


[An INTENT(OUT) argument is undefined at the beginning of a procedure](https://twitter.com/fortrantip/status/1485594671300632576) 7:45 AM · Jan 24, 2022 [intent_out_undefined.f90](./intent_out_undefined.f90)


[Turn compiler warnings into errors to force code defects to be fixed.](https://twitter.com/fortrantip/status/1485235396179079173) 7:58 AM · Jan 23, 2022 [warnings.f90](./warnings.f90)


[VALUE attribute for procedure arguments introduced in Fortran 2003](https://twitter.com/fortrantip/status/1484874794352918528) 8:05 AM · Jan 22, 2022 [value.f90](./value.f90)


[Use INTRINSIC to specify that compiler-provided procedures and modules are referenced](https://twitter.com/fortrantip/status/1484517091738886147) 8:23 AM · Jan 21, 2022 [intrinsic.f90](./intrinsic.f90)


[PROTECTED module variables cannot be changed outside the module.](https://twitter.com/fortrantip/status/1484136749924245509) 7:12 AM · Jan 20, 2022 [protected.f90](./protected.f90)


[Array constructor with [] was introduced in Fortran 2003. Still valid is (//)](https://twitter.com/fortrantip/status/1483773578839474180) 7:09 AM · Jan 19, 2022


[Impure elemental procedure can be used to generate array of non-uniform variates](https://twitter.com/fortrantip/status/1483430581232967684) 8:26 AM · Jan 18, 2022 [random_normal.f90](./random_normal.f90)


[Fortran 2008 introduced IMPURE ELEMENTAL procedures](https://twitter.com/fortrantip/status/1483063464562204672) 8:07 AM · Jan 17, 2022 [impure_elemental.f90](./impure_elemental.f90)


[List of Fortran compilers, build tools, text editors, etc.](https://twitter.com/fortrantip/status/1482709817466707969) 8:42 AM · Jan 16, 2022 [list](https://github.com/Beliavsky/Fortran-Tools)


[Use iostat and iomsg to handle READ errors](https://twitter.com/fortrantip/status/1482687630877892608) 7:14 AM · Jan 16, 2022 [iomsg.f90](./iomsg.f90) ; [data_file](./iomsg_data_file.txt)


[An unqualified USE foo statement imports public entities defined in foo and what foo imported.](https://twitter.com/fortrantip/status/1482328990798987266) 7:29 AM · Jan 15, 2022 [imports.f90](./imports.f90)


[Module entities are PUBLIC by default.](https://twitter.com/fortrantip/status/1481970740475932676) 7:45 AM · Jan 14, 2022 [private.f90](./private.f90)


[How to rename an imported module entity](https://twitter.com/fortrantip/status/1481597325499842563) 7:01 AM · Jan 13, 2022 [rename.f90](./rename.f90)


[Use the same name for analogous procedures defined in different modules using an INTERFACE](https://twitter.com/fortrantip/status/1481247763048407042) 7:52 AM · Jan 12, 2022 [shared_interface.f90](./shared_interface.f90)


[Procedures can be called with a mix of named and positional arguments.](https://twitter.com/fortrantip/status/1480893840068390913) 8:26 AM · Jan 11, 2022 [arguments.f90](./arguments.f90)


[UnALLOCATED variable passed to a procedure is not PRESENT there.](https://twitter.com/fortrantip/status/1480585104997163018) 11:59 AM · Jan 10, 2022


[DIMENSION can be used to declare several arrays of the same SHAPE](https://twitter.com/fortrantip/status/1480162604559523840) 8:00 AM · Jan 9, 2022 [dimension.f90](./dimension.f90)


[Propagation of an optional argument](https://twitter.com/fortrantip/status/1479805991382360066) 8:23 AM · Jan 8, 2022 [optional_use.f90](./optional_use.f90)


[Two types of syntax for defining a function](https://twitter.com/fortrantip/status/1479641195898826754) 9:28 PM · Jan 7, 2022 [function.f90](./function.f90) [function.txt](./function.txt)


[Syntax for character array without manual padding](https://twitter.com/fortrantip/status/1479487784205402116) 11:19 AM · Jan 7, 2022 [character_array.f90](./character_array.f90)


[Intrinsic character functions](https://twitter.com/fortrantip/status/1479391930744283144) 4:58 AM · Jan 7, 2022 [string_func.f90](./string_func.f90)


[Substrings of character variable arrays](https://twitter.com/fortrantip/status/1479128610623606787) 11:31 AM · Jan 6, 2022 [substring.f90](./substring.f90)


[Parenthesize a variable to copy it "on the fly".](https://twitter.com/fortrantip/status/1479071485859962880) 7:44 AM · Jan 6, 2022 [overlapping_arg.f90](./overlapping_arg.f90)


[Use integer powers when possible.](https://twitter.com/fortrantip/status/1478765410405298176) 11:28 AM · Jan 5, 2022 [pow_real.f90](./pow_real.f90)


[Use d0 or \_kind to make a constant double precision.](https://twitter.com/fortrantip/status/1478713534850736129) 8:02 AM · Jan 5, 2022 [precision.f90](./precision.f90)


[KIND numbers of types are not portable across compilers and should not be used directly.](https://twitter.com/fortrantip/status/1478526602136981511) 7:39 PM · Jan 4, 2022


[Avoid implicit save](https://twitter.com/fortrantip/status/1478363292028784645) 8:50 AM · Jan 4, 2022 [implicit_save.f90](./implicit_save.f90) [run](https://onlinegdb.com/BCZzmjYxs)


[Use parameters to dimension fixed-size arrays to make a code easier to change](https://twitter.com/fortrantip/status/1478331686412861440) 6:45 AM · Jan 4, 2022


[Fortran 2008 introduced z%re and z%im as alternatives to real(z) and aimag(z)](https://twitter.com/fortrantip/status/1478160269671124993) 7:24 PM · Jan 3, 2022 [im_re.f90](./im_re.f90)


[KindFinder code finds all KIND Values implemented by a compiler](https://twitter.com/fortrantip/status/1478030318485577728) 10:47 AM · Jan 3, 2022 [kindfind.f90](./kindfind.f90)


[Real and integer KIND constants from iso_fortran_env; HUGE() and TINY()](https://twitter.com/fortrantip/status/1477985901145993221) 7:51 AM · Jan 3, 2022 [iso_kinds.f90](./iso_kinds.f90)


[Advance="no" specifier of WRITE](https://twitter.com/fortrantip/status/1477788560359141382) 6:47 PM · Jan 2, 2022 [advance_no.f90](./advance_no.f90)


[Len of character variable function result can depend on arguments](https://twitter.com/fortrantip/status/1477632693617799169) 8:27 AM · Jan 2, 2022 [join.f90](./join.f90)


[How size of an array function result can depend on function arguments](https://twitter.com/fortrantip/status/1477606275643019269) 6:42 AM · Jan 2, 2022 [array_func.f90](./array_func.f90)


[List of the syntax and purpose of Fortran intrinsics, with usage examples](https://twitter.com/fortrantip/status/1477320332751130625) 11:46 AM · Jan 1, 2022


[Do case-insensitive string comparisons by converting to lower case](https://twitter.com/fortrantip/status/1477278656376590340) 9:00 AM · Jan 1, 2022 [lower_case.f90](./lower_case.f90)


[Fortran-lang suggested variable naming conventions](https://twitter.com/fortrantip/status/1477282631553269764) 9:16 AM · Jan 1, 2022


[Case insensitivity](https://twitter.com/fortrantip/status/1477230568781795334) 10:49 AM · Jan 1, 2022 [case_insensitivity.f90](./case_insensitivity.f90)


[Returning multiple values from a subroutine or function](https://twitter.com/fortrantip/status/1476724929299197962) 8:20 PM · Dec 30, 2021 [subroutine_dt.f90](./subroutine_dt.f90)


[MODULO vs. MOD function](https://twitter.com/fortrantip/status/1476541936681066501) 7:13 AM · Dec 30, 2021


[Compiler Support for the Fortran 2008 and 2018 Standards](https://twitter.com/fortrantip/status/1476281645011505162) 1:59 PM · Dec 29, 2021


[Many compilers evaluate ALL(x==y) efficiently with short-circuiting](https://twitter.com/fortrantip/status/1476255945923641347) 12:16 PM · Dec 29, 2021


[LEN of a character variable may be deferred in Fortran 2003 on](https://twitter.com/fortrantip/status/1476201645885337611) 8:41 AM · Dec 29, 2021 [deferred_character.f90](./deferred_character.f90)


[To learn about Fortran beyond F95, read the New Features articles of John Reid](https://twitter.com/fortrantip/status/1476150602866511873) 5:18 AM · Dec 29, 2021


[Use .true. and .false. for Booleans, not 1 and 0](https://twitter.com/fortrantip/status/1475905587774959616) 1:04 PM · Dec 28, 2021


[Standards committee has approved conditional expressions](https://twitter.com/fortrantip/status/1475840940791279616) 8:47 AM · Dec 28, 2021


[ANY and ALL may not be the most efficient methods to compare arrays.](https://twitter.com/fortrantip/status/1475829444543717378) 8:02 AM · Dec 28, 2021


[Consider using a tolerance to compare floats](https://twitter.com/fortrantip/status/1475826650835214338) 7:51 AM · Dec 28, 2021 [compare_floats.f90](./compare_floats.f90)


[Use ALL(A==B) to test for array equality](https://twitter.com/fortrantip/status/1475822105358913540) 7:33 AM · Dec 28, 2021 [all_any.f90](./all_any.f90)


[Intel Fortran Compiler (ifx)](https://twitter.com/fortrantip/status/1475494838074318852) 9:52 AM · Dec 27, 2021


[Doubled delimiter in a string is regarded as a single character of the constant](https://twitter.com/fortrantip/status/1475453317526528003) 7:07 AM · Dec 27, 2021 [doubled_delim.f90](./doubled_delim.f90)


[Store data as an array of derived types or a derived type with array components?](https://twitter.com/fortrantip/status/1475133178763427848) 9:55 AM · Dec 26, 2021 [derived_type_array.f90](./derived_type_array.f90)


[Fortran is column-major](https://twitter.com/fortrantip/status/1475049356155883524) 4:22 AM · Dec 26, 2021 [column_major.f90](./column_major.f90)


[CMPLX should be used with a KIND argument](https://twitter.com/fortrantip/status/1474537984066301959) 6:30 PM · Dec 24, 2021 [cmplx.f90](./cmplx.f90)


[RESHAPE with the optional ORDER and PAD arguments](https://twitter.com/fortrantip/status/1474394605890244614) 9:00 AM · Dec 24, 2021 [reshape_array.f90](./reshape_array.f90)


[Use GAMMA to compute factorials](https://twitter.com/fortrantip/status/1474357943667671060) 6:35 AM · Dec 24, 2021 [factorial.f90](./factorial.f90)


[Derived type definition, initialization, and operator overloading](https://twitter.com/fortrantip/status/1474169072665440259) 6:04 PM · Dec 23, 2021 [date.f90](./date.f90)


[List-directed vs. explicitly formatted output](https://twitter.com/fortrantip/status/1474105626611662857) 1:52 PM · Dec 23, 2021


[Fortran equivalents of NumPy](https://twitter.com/fortrantip/status/1473958733571104773) 4:08 AM · Dec 23, 2021


[Zero-size array constructor such as [real ::]](https://twitter.com/fortrantip/status/1473848675566858242) 8:51 PM · Dec 22, 2021 [zero_size.f90](./zero_size.f90)


[Use G0.d and colon edit descriptors with infinite repeat count to write delimited (CSV, etc.) output](https://twitter.com/fortrantip/status/1473680777279852553) 9:44 AM · Dec 22, 2021


[If allocation errors must be handled, use ALLOCATABLE rather than automatic arrays in procedures](https://twitter.com/fortrantip/status/1473636468405030913) 6:48 AM · Dec 22, 2021 [automatic.f90](./automatic.f90)


[Name modules and the source files containing them consistently, with one module per file.](https://twitter.com/fortrantip/status/1473340740055015431) 11:13 AM · Dec 21, 2021


[Use unformatted stream of Fortran 2003 for large-scale I/O.](https://twitter.com/fortrantip/status/1473261954244435973) 5:59 AM · Dec 21, 2021 [stream_io.f90](./stream_io.f90)


[Using READ and WRITE for file i/o](https://twitter.com/fortrantip/status/1472999893631447043) 12:38 PM · Dec 20, 2021 [read_write_file.f90](./read_write_file.f90)


[Reading user input](https://twitter.com/fortrantip/status/1472941850218700805) 8:47 AM · Dec 20, 2021 [read_sum.f90](./read_sum.f90)


[SELECT CASE for conditional execution](https://twitter.com/fortrantip/status/1472930444572336128) 8:02 AM · Dec 20, 2021 [select_case.f90](./select_case.f90)


[Declare floating point variables with KINDs](https://twitter.com/fortrantip/status/1472771842242920451) 9:32 PM · Dec 19, 2021 [kind.f90](./kind.f90)


[Replace non-standard REAL\*8 declaration with REAL(KIND=REAL64)](https://twitter.com/fortrantip/status/1472772577600942083) 9:35 PM · Dec 19, 2021


[Use PARAMETERs in modules to define physical and mathematical constants](https://twitter.com/fortrantip/status/1472718436040073226) 6:00 PM · Dec 19, 2021 [module_parameter.f90](./module_parameter.f90)


[Procedures can be RECURSIVE](https://twitter.com/fortrantip/status/1472702427740745728) 4:56 PM · Dec 19, 2021


[Specify function and subroutine argument INTENTs](https://twitter.com/fortrantip/status/1472698233298333699) 4:39 PM · Dec 19, 2021


[Subroutines can have INTENT(IN OUT) arguments, but functions should not](https://twitter.com/fortrantip/status/1472696912541364224) 4:34 PM · Dec 19, 2021 [intent_in_out.f90](./intent_in_out.f90)


[Define and call a subroutine](https://twitter.com/fortrantip/status/1472692305522044932) 4:16 PM · Dec 19, 2021 [subroutine.f90](./subroutine.f90)


[Demonstrate optional arguments and RANDOM_NUMBER](https://twitter.com/fortrantip/status/1472684194765672450) 3:44 PM · Dec 19, 2021 [optional.f90](./optional.f90)


[Function overloading using an interface with module procedures](https://twitter.com/fortrantip/status/1472629090758836229) 12:05 PM · Dec 19, 2021 [interface.f90](./interface.f90)


[USE, ONLY to avoid polluting the namespace](https://twitter.com/fortrantip/status/1472613921886552065) 11:04 AM · Dec 19, 2021


[Put functions and subroutines in modules to ensure that interfaces are checked.](https://twitter.com/fortrantip/status/1472610403884670976) 10:50 AM · Dec 19, 2021 [module.f90](./module.f90)


[ELEMENTAL functions broadcast arguments](https://twitter.com/fortrantip/status/1472606914857078793) 10:37 AM · Dec 19, 2021 [elemental.f90](./elemental.f90)


[Functions should be PURE and have INTENT(IN) arguments](https://twitter.com/fortrantip/status/1472603894886932482) 10:25 AM · Dec 19, 2021 [func.f90](./func.f90)


[PACK selects elements](https://twitter.com/fortrantip/status/1472600871192125451) 10:13 AM · Dec 19, 2021 [count_pack.f90](./count_pack.f90)


[Loop variable equals the upper bound plus the stride after normal completion of a loop](https://twitter.com/fortrantip/status/1472598697489965061) 10:04 AM · Dec 19, 2021 [do_loop_index.f90](./do_loop_index.f90)


[Associate creates an alias for expressions or variables.](https://twitter.com/fortrantip/status/1472565511628197891) 7:52 AM · Dec 19, 2021 [assoc.f90](./assoc.f90)


[In addition to if-elseif, Fortran has a one-line if](https://twitter.com/fortrantip/status/1472365082067755017) 6:36 PM · Dec 18, 2021 [one_line_if.f90](./one_line_if.f90)


[Character variables are padded with spaces at the end if necessary.](https://twitter.com/fortrantip/status/1472209602074849285) 8:18 AM · Dec 18, 2021


[An array of character variables has elements of the same LEN(gth).](https://twitter.com/fortrantip/status/1472207576133783564) 8:10 AM · Dec 18, 2021 [char.f90](./char.f90)


[MERGE(x,y,condition) returns x if condition is true, otherwise y](https://twitter.com/fortrantip/status/1472205323763073026) 8:01 AM · Dec 18, 2021 [merge.f90](./merge.f90)


[IF-ELSEIF-ENDIF block](https://twitter.com/fortrantip/status/1472202678054920196) 7:50 AM · Dec 18, 2021 [if.f90](./if.f90)


[New Fortran code should be written using free source form and stored in a file with the .f90 suffix.](https://twitter.com/fortrantip/status/1472183935044145157) 6:36 AM · Dec 18, 2021


[Fortran has allocation on assignment.](https://twitter.com/fortrantip/status/1472181598833549316) 6:26 AM · Dec 18, 2021 [alloc.f90](./alloc.f90)


[SUM and other array functions have an optional DIM(ension) argument.](https://twitter.com/fortrantip/status/1472018791525720069) 7:40 PM · Dec 17, 2021 [2d_array.f90](./2d_array.f90)


[Fortran arrays can have any lower bound. The default is 1.](https://twitter.com/fortrantip/status/1471997763848183810) 6:16 PM · Dec 17, 2021 [bounds.f90](./bounds.f90)


[Fortran array sections contain both endpoints](https://twitter.com/fortrantip/status/1471994100161388545) 6:01 PM · Dec 17, 2021 [sections.f90](./sections.f90)


[Array intrinsic functions: SUM, MINVAL, MAXVAL, MINLOC, FINDLOC](https://twitter.com/fortrantip/status/1471989760046641153) 5:44 PM · Dec 17, 2021 [array_intrinsics.f90](./array_intrinsics.f90)


[Integer division truncates.](https://twitter.com/fortrantip/status/1471936756857643008) 2:14 PM · Dec 17, 2021


[\** is the exponentiation operator.](https://twitter.com/fortrantip/status/1471903802185986050) 12:03 PM · Dec 17, 2021 [power.f90](./power.f90)


[Fortran compilers and tutorials](https://twitter.com/fortrantip/status/1471897319671046147) 11:37 AM · Dec 17, 2021


[EXIT a loop](https://twitter.com/fortrantip/status/1471895490346291206) 11:30 AM · Dec 17, 2021 [sum_exit.f90](./sum_exit.f90)


[DO-ENDDO loop](https://twitter.com/fortrantip/status/1471891644370796550) 11:14 AM · Dec 17, 2021 [loop.f90](./loop.f90)


[Intrinsic data types: integer, real, complex, logical, and character](https://twitter.com/fortrantip/status/1471890355561943054) 11:09 AM · Dec 17, 2021


[Hello World](https://twitter.com/fortrantip/status/1471887565745799173) 10:58 AM · Dec 17, 2021 [hello_world.f90](./hello_world.f90)