Question

How to implement the fabs function in C

Answer 1

#include <stdio.h>

double fabs(double x) {
    if (x == 0)
        return 0.0;

    return x < 0.0 ? -x : x;
}

int main()
{
    printf("fabs(-1.1) = %.6f\n", fabs(-1.1));
    printf("fabs(1.1) = %.6f\n", fabs(1.1));
    printf("fabs(0) = %.6f\n", fabs(0));
    printf("fabs(-0) = %.6f\n", fabs(-0));
    printf("fabs(-0.5) = %.6f\n", fabs(-0.5));

    return 0;
}




/*
run:

fabs(-1.1) = 1.100000
fabs(1.1) = 1.100000
fabs(0) = 0.000000
fabs(-0) = 0.000000
fabs(-0.5) = 0.500000

*/

 

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