How to calculate the absolute value in the C language?

In C language, you can use the abs function to calculate the absolute value of an integer.

#include <stdio.h>
#include <stdlib.h>

int main() {
    int num = -5;
    int absolute = abs(num);
    printf("The absolute value of %d is %d\n", num, absolute);
    return 0;
}

The output results are:

The absolute value of -5 is 5

The fabs function can be used to calculate the absolute value of a floating point number.

#include <stdio.h>
#include <math.h>

int main() {
    float num = -3.14;
    float absolute = fabs(num);
    printf("The absolute value of %.2f is %.2f\n", num, absolute);
    return 0;
}

The output result is:

The absolute value of -3.14 is 3.14