Question

How to check for signed integer overflow in C

Answer 1

#include <limits.h>
#include <stdio.h>

int add_without_overflow(int a, int b) {
    if ((b > 0 && a > INT_MAX - b) || (b < 0 && a < INT_MIN - b)) {
        printf("Overflow!\n");
        return 0; // Return a safe value or handle the overflow
    }
    
    return a + b;
}

int main() {
    int a = INT_MAX;
    int b = 1;
    
    int result = add_without_overflow(a, b);
    
    printf("Result: %d\n", result);
    
    return 0;
}



/*
run:

Overflow!
Result: 0

*/

 

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