应用指针变量实现字符串的逆序显示：① +，-，*，/，^，| 分别代表加、减、乘、除、乘方、开平方。

② 输入上述符号，输入则显示“你操作有误！”，然后退出程序；

如果输入正确，则提示用户输入相应的数据，然后进行计算并

显示结果。-Application of the reverse pointer for string variables showed: ①+,-,*,/,^,| representing addition, subtraction, multiplication, division, power, square root. ② Enter the symbol, enter the show, " You made a mistake!" , And then exit the program　if the input is correct, then prompt the user to enter the appropriate data and then calculates and displays the results.