fabs, fabsf, fabsl - absolute value of floating-point number

#include <math.h>

double fabs(double x);
float fabsf(float x);
long double fabsl(long double x);

Link with -lm.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

These functions return the absolute value of the floating-point number x.

These functions return the absolute value of x.

If x is a NaN, a NaN is returned.

If x is -0, +0 is returned.

If x is negative infinity or positive infinity, positive infinity is returned.

abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)