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https://github.com/tcort/tcbasic

tcbasic is a small BASIC Interpreter written in C.
https://github.com/tcort/tcbasic

basic interpreter tinybasic

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tcbasic is a small BASIC Interpreter written in C.

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# tcbasic

tcbasic is a small [BASIC](http://en.wikipedia.org/wiki/BASIC) Interpreter
written in [C](http://en.wikipedia.org/wiki/C_%28programming_language%29).

## Current Status

The "basics" are done and working. The interpreter implements the
[Tiny BASIC](http://en.wikipedia.org/wiki/Tiny_BASIC) dialect of BASIC
with added support for floating point numbers and many of the built-in mathematical
functions in [Dartmouth BASIC](http://en.wikipedia.org/wiki/Dartmouth_BASIC).
Development will continue with the goal of implementing successively more
complete dialects of BASIC.

## Requirements

* C compiler and standard build tools (make, sh, ...).
* [cmake](https://cmake.org/)

## Building

Standard cmake build (`make test` runs the test suite):

$ cd bin
$ cmake ..
$ make
$ make test
# make install

## Using

Start the interpreter in interactive mode:

$ tcbasic

Execute a program from a file in batch mode:

$ tcbasic sample.bas

## Example Program

10 REM Square Root Calculator using Newton's Method

100 LET X = 1337
400 GOSUB 1000
500 PRINT "The square root of ",X," is approximately ",Y
600 END

1000 REM Calculate the square root of a given Number
1001 REM Expects input to be in X. Output will be in Y.
1002 REM Uses Z as a temporary variable.
1050 LET Y = 0.5 * X
1100 LET Z = Y
1200 LET Y = Y-(((Y^2)-X)/(2*Y))
1300 IF Z <> Y THEN GOTO 1100
1400 RETURN

## Language Reference

See `LANG.md`

## License

See `COPYING` for the full license. Here's a summary:

tcbasic - a small BASIC Interpreter written in C.
Copyright (C) 2015, 2016, 2017, 2018, 2020 Thomas Cort

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see .