https://github.com/yasulab/lp-calculator

A calculator as a language processer
https://github.com/yasulab/lp-calculator

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A calculator as a language processer

• Host: GitHub
• URL: https://github.com/yasulab/lp-calculator
• Owner: yasulab
• Created: 2011-05-31T08:28:25.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2011-05-31T08:34:45.000Z (over 13 years ago)
• Last Synced: 2024-10-10T09:24:05.161Z (about 1 month ago)
• Language: C
• Homepage: http://yasulab.blogspot.com/2008/06/calculator-with-lp-2.html
• Size: 93.8 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README

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README

        
Description

-----------

This program is a calculator which can run along this specification below.

1. can use operands: +, -, *, /, %

2. can use Gauss's integer using branckets

3. can change priority of operation using parenthsis

4. can assign value to a valuable structured by alphabets 

The specification is implemented by this syntax rule below.

expression = ['-'] term {('+'|'-') term }

term = primary {('*'|'/'|'%') primary }

primary = character | figure | '(' expression ')' | '[' expression ']'

character = ID | ID '=' expression

figure = {number} ['.' {number}]

number = 0|1|2|3|4|5|6|7|8|9

ID = a|b|...|y|z|A|B|...|Y|Z

Sample Output

-------------

yohei@YOHEI-note ~/wl/calc

$ gcc calc.c -o calc

yohei@YOHEI-note ~/wl/calc

$ ./calc

/* General Operations */

# +2-1

>> 1.000000

# -2-1

>> -3.000000

# 2+5*10

>> 52.000000

# 2*5+10

>> 20.000000

# 2*(5+10)

>> 30.000000

# 3/2

>> 1.500000

# 5.5/2.2

>> 2.500000

# [5.5/2.2]

>> 2.000000

# [5/(1+1)]

>> 2.000000

# 2/1+6%3

>> 2.000000

# 4.9%0.3

>> 0.100000

# two=2

two holds 2.000000

>> 2.000000

# five=5

five holds 5.000000

>> 5.000000

# ten=10

ten holds 10.000000

>> 10.000000

# hundred=100

hundred holds 100.000000

>> 100.000000

# -(ten+five/two)*two*hundred

>> -2500.000000

#

shut down this program...

yohei@YOHEI-note ~/wl/calc

$

/* Exception Handler*/

# 1+ 2++ 4

error: incorrect position of symbol.

1+ 2++ 4

^

1 error was found.

# (1+3*4

error: missing ')'

(1+3*4

^

1 error was found.

# 1++[2*3**1

error: incorrect position of symbol.

1++[2*3**1

^

error: incorrect position of symbol.

1++[2*3**1

^

error: missing ']'

1++[2*3**1

^

3 errors were found.

# two+five*second+ten

error: not registered word is used.

two+five*second+ten

^

1 error was found.

# 1.3.4.5.6

unexpected error