Problem:
Score : 100 points

Problem Statement

Joisino wants to evaluate the formula "A op B".
Here, A and B are integers, and the binary operator op is either + or -.
Your task is to evaluate the formula instead of her.

Constraints

1≦A,B≦10^9

op is either + or -.

Input

The input is given from Standard Input in the following format:

A op B

Output

Evaluate the formula and print the result.

Sample Input 1

1 + 2

Sample Output 1

3

Since 1 + 2 = 3, the output should be 3.

Sample Input 2

5 - 7

Sample Output 2

-2

Solution in C (GCC 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>
int main()
{
   int a,b,C=0,D=0;
   char o;
   scanf("%d%C%d",&a,&o,&b);

   if(1<=a && a<=10^9 && 1<=b && b<=10^9){
       switch(o){
        case '+':
            C =a+b;
            printf("\n%d",C);
            break;
        case '-':
            D=a-b;
            printf("\n%d",D);
            break;
        default:
            break;
        }
   }
    return 0;
}