Problem:
Simple Calculator

Write a program which reads two integers a, b and an operator op, and then prints the value of a op b.

The operator op is '+', '-', '*' or '/' (sum, difference, product or quotient). The division should truncate any fractional part.

Input

The input consists of multiple datasets. Each dataset is given in the following format.

a op b

The input ends with a dataset where op = '?'. Your program should not process for this dataset.

Output

For each dataset, print the value in a line.

Constraints

0 ≤ a, b ≤ 20000

No divisions by zero are given.

Sample Input 1

1 + 2
56 - 18
13 * 2
100 / 10
27 + 81
0 ? 0

Sample Output 1

3
38
26
10
108

Solution in C (judge verdict: Time Limit Exceeded)

#include <stdio.h>

int a,b;
char op;
int ans;

double pai=3.141592653589;

main(){
  
  while(1){
  
  scanf("%d%c%d",&a,&op,&b);
  switch(op){
  
   case '+' :
   ans=a+b;
    printf("%d\n",ans);
    ans=0;
   break;
   
   case '-' :
   ans=a-b;
    printf("%d\n",ans);
    ans=0;
   break;
   
   case '*' :
   ans=a*b;
    printf("%d\n",ans);
    ans=0;
   break;
   
   case '/' :
   ans=a/b;
    printf("%d\n",ans);
    ans=0;
   break;
  
  case '?' :
  return 0;
   
  
  }
  
  }
}