Help me in solving LJAJAG27 problem

help
,
1

My issue

output is coming properly but runtime error every time I submit it

My code

#include <stdio.h>

int main() {
	// your code goes here
	char op;
	int a, b;
	float res;
	
	   
	    scanf("%c", &op);
	    
	    scanf("%d %d", &a, &b);
	    
	    switch(op){
	        case '+': 
	        printf("%d", a + b);
	        break;
	        
	        case '-':
	        printf("%d", a - b);
	        break;
	        
	        case '*':
	        printf("%d", a * b);
	        break;
	        
	        case '/':
	        printf("%d", a / b);
	        break;
	        
	        default:
	        printf("Invalid Choice\n");
	    }
	    return 0;
}

Learning course: Learn C Programming
Problem Link: https://www.codechef.com/learn/course/rcpit-programming-c/RCPITLPC37/problems/LJAJAG27