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 cmp(const char* str_1, const char* str_2){
   
   while(*str_1 == *str_2){
     if(*str_1 == '\0')
       return 0;
     
     str_1++;
     str_2++;  
   }

 return (unsigned char)*str_1 - (unsigned char)*str_2;
}

int main(void){
  int a,b;
  char str[2];

  scanf("%d %s %d",&a,str,&b);

  while(1){
   
   if(cmp(str,"?")== 0)
      break;
   if(cmp(str,"+") == 0)
      printf("%d\n",a + b);
    else if(cmp(str,"-") == 0)
      printf("%d\n",a - b);
     else if(cmp(str,"*") == 0)
      printf("%d\n",a * b);
    else if(cmp(str,"/") == 0)
      printf("%d\n",a / b);
   

  }

  return 0;
}