Question

How to handle invalid argument in C

Answer 1

#include <stdio.h>

enum {
    E_OK,
    E_OUT_OF_RANGE
};

int square(int x, int *result) {
    if (x > 1003789256) {
        return E_OUT_OF_RANGE;
    }
    *result = x * x;
    
    return E_OK;
}

int main() {
    int result = 0;
    
    if (square(12, &result) == E_OK) {
        printf("%d\n", result);
    }
    
    if (square(1003789257, &result) == E_OUT_OF_RANGE) {
        puts("OUT OF RANGE");
    }

    return 0;
}



/*
run:

144
OUT OF RANGE

*/

 

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