C写的一个语法分析器，输入可包含main,int,void,if,else,do,while几个关键字，算符可包括+,-,*,/,++,--,==,!=,<,>,<=,>=，输出求解过程-Write a C parser, type may include main, int, void, if, else, do, while a number of keywords, operators may include+,-,*,/,++,--,==, solving process !=,< ,> ,< =,> =, output