A LL Mathematical Parser written in C.
make
./eval-expr "3 + 42 * (1 - 2 / (3 + 4) - 1 % 21) + 1"S ::= op_low
op_low ::= op_high[['+'|'-']op_high]*
op_high ::= path[['*'|'/'|'%']path]*
path ::= '('S')'|number
number ::= ['0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9']+
The MIT License (MIT) - see LICENSE for more details