C Tutorial/math.h/fabs
fabs
Item Value Header file math.h Declaration float fabsf(float num);double fabs(double num);long double fabsl(long double num); Return returns the absolute value of num.
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%1.1f %1.1f", fabs(1.0), fabs(-1.0));
return 0;
}