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