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HP-UX 11i Version 3: February 2007

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fmax(), fmaxf(), fmaxl(), fmaxw(), fmaxq() — maximum value functions


#include <math.h>

double fmax(double x, double y);

HP Integrity Server Only

float fmaxf(float x, float y);

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

extended fmaxw(extended x, extended y);

quad fmaxq(quad x, quad y);


The fmax() function determines the maximum numeric value of its arguments.

Integrity Server Only

fmaxf() is a float version of fmax(); it takes float arguments and returns a float result.

fmaxl() is a long double version of fmax(); it takes long double arguments and returns a long double result.

fmaxw() is an extended version of fmax(); it takes extended arguments and returns an extended result.

fmaxq() is equivalent to fmaxl() on HP-UX systems.


To use this function, compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. To use (for Integrity servers) fmaxw() or fmaxq(), compile with the -fpwidetypes option. Make sure your program includes <math.h>. Link in the math library by specifying -lm on the compiler or linker command line.


The fmax() function returns the maximum numeric value of its arguments.

If one argument is a NaN and the other is numeric, fmax() returns the numeric argument.

If both arguments are NaNs, fmax() returns NaN.


No errors are defined.


fmax(), fmaxf(), fmaxl() : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

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