PTA-Calculating an expression

                                   Calculating an expression

Given an mathematic expression, you soppose to print out the value of this espression.

Input Specification:

Given an mathematic expression, include 2 integer operands and 1 operator (+,-,*,/ ). No extra space allowed.

Output Specification:

Output the answer. If the operator is "/", keep 2 decimal digits behind point; else, output in integer.

Sample Input 1:

10+15

Sample Output 1:

25

Sample Input 2:

5/3

Sample Output 2:

1.67

 

解答：

#include <stdio.h>
int main()