Determine maximum of two floating-point numbers

**#include <math.h>**

**double fmax(double ***x***, double ***y***);**

**float fmaxf(float ***x***, float ***y***);**

**long double fmaxl(long double ***x***, long double ***y***);**

Link with *-lm*.

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

**fmax**(), **fmaxf**(), **fmaxl**():

_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;

or *cc -std=c99*

These functions return the larger value of *x* and *y*.

These functions return the maximum of *x* and *y*.

If one argument is a NaN, the other argument is returned.

If both arguments are NaN, a NaN is returned.

No errors occur.

These functions first appeared in glibc in version 2.1.

The **fmax**(), **fmaxf**(), and **fmaxl**() functions are thread-safe.

C99, POSIX.1-2001.

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