为了比较满足自己完美主义的追求..花了点时间。支持＋－＊／，（）优先运算。封装c++标准库异常处理(c++标准)，堆栈算法（明了易懂，功能强大）。注释也比较全。 适合大家交流作用。 -In order to compare the pursuit to satisfy his perfectionist .. took some time. Support+-*/,() priority operations. Package c++ standard library exception