资 源 简 介
另外一个关于表达式求值的程序，功能强大，可以计算带有次方的表达式 ，而且可以先输入字母，再对字母赋值-A program which can calulate the value of a expression, it owns powerful function, and can calculate the expression which has limited power, also it can input letters firstly,then assign value towards letters.
