实验目的

掌握栈的特性，能利用栈的特性进行实际应用。

掌握“运算符优先法”，并能利用该算法对表达式求值。

实验要求

求一个表达式的值：输入一个包含“+”、“-”、“*”、“/”、正整数和圆括号的合法表达式，计算该表达方式的运算结果。

有能力的同学可以考虑操作数为多位浮点数的情况。

所写源代码编程风格良好，有详细注释。

程序运行界面良好。-Objective To know the characteristics of the stack test, can take advantage of the practical application of the characteristics of the stack. Master the " Law of operator precedence,"　and can use the algorithm expression is evaluated. Experiment requires the value of seeking an expression: Enter a positive integer and the parentheses contain " +" ," -" ," *" ," /" , the legitimate expression to calculate the operation result of the expression. The ability of students to consider a number of floating-point operand is the case. Source code written in good programming style, with detailed comments. Interface program runs well.