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c99 [ flag... ] file... -lm [ library... ] #include <math.h>
double fabs(double x);
float fabsf(float x);
long double fabsl(long double x);
These functions compute the absolute value of x, |x|.
Upon successful completion, these functions return the absolute value of x.
If x is NaN, a NaN is returned.
If x is ±0, +0 is returned.
If x is ±Inf, +Inf is returned.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
Interface Stability | Standard |
MT-Level | MT-Safe |
isnan(3M), math.h(3HEAD), attributes(5), standards(5)