数据结构的实验报告：包括了源码，本程序可以对正确的表达式能给出正确结果；对不正确的表达式能指出错误，如少左括号，少右括号等-Data structure lab report: include the source, this procedure can correct expression can give accurate results　on incorrect expressions can point out errors, such as less left parenthesis, right bracket, etc. less