Ho to make and error handling exception without using any class?

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C

I want to know how to make an error handling for this code without using any class.
-
Would that be possible?

What I have tried:

#include <stdio.h>


int main()
{


int a;
int b;
int sum;
printf("Enter first number:");
scanf("%d", &a );
printf("Enter second number:");
scanf("%d", &b );
printf("The sum of:");
printf("%d", sum=a+b);
printf("The product of:");
printf("%d", sum=a*b);
printf("The quotient of:");
printf("%d", sum=a/b);
printf("The difference of:");
printf("%d", sum=a-b);
printf("The modulus of:");
printf("%d", sum=a%b);
return(0);

}