Question

How to use !!(variable) to force a variable to be either 0 or 1 in C

Answer 1

#include <stdio.h>

// 0 remains 0, but any non-zero value becomes 1

int main() {
    int x = 5;
    printf("%d\n", !!(x));
    
    x = 923928;
    printf("%d\n", !!(x));
    
    x = -1;
    printf("%d\n", !!(x));
    
    x = -3723;
    printf("%d\n", !!(x));
    
    x = 0;
    printf("%d\n", !!(x));
}



/*
run:

1
1
1
1
0

*/

 

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