C/C++表达式解析（可用于脚本解析功能实现）

A simple command line calculator that uses a recursive descent parser, written in C. Made as an exercise in tokenizing and parsing... ## Supported features Below is the BNF of the parser. The functions are named and behave the same as those found in C64 BASIC. expression = ["+"|"-"] term {("+"|"-"|"OR") term} . term = factor {( "*" | "/" | "AND" ) factor} . factor = func "(" expression ")" | number | "(" expression ")" . func = ABS | AND | ATN | COS | EXP | INT | LOG | NOT | OR | RND | SGN | SIN | SQR | TAN