calculator with LP

I finally have seen the goal of this programming!, namely making a calculator program using knowledge of language processor I have studied.
However, this program has still a lot of errors, so I will brush up tomorrow.
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


Finally, I have implemented it so far, as this draft program below.
I feel I will be able to finish it including report!

* To see the source of "calculator.c", please visit the following page.
https://github.com/yasulab/calculator-with-lp

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