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1.23 fmax, fmaxf—maximum

Synopsis 

     #include <math.h>
     double fmax(double x, double y);
     float fmaxf(float x, float y);

Description
The fmax functions determine the maximum numeric value of their arguments. NaN arguments are treated as missing data: if one argument is a NaN and the other numeric, then the fmax functions choose the numeric value.
Returns
The fmax functions return the maximum numeric value of their arguments.
Portability
ANSI C, POSIX.