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HP-UX 11i Version 3: February 2007

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tanh(), tanhf(), tanhl(), tanhw(), tanhq() — hyperbolic tangent functions


#include <math.h>

double tanh(double x);

float tanhf(float x);

HP Integrity Server Only

long double tanhl(long double x);

extended tanhw(extended x);

quad tanhq(quad x);


tanh() returns the hyperbolic tangent of x.

tanhf() is a float version of tanh(); it takes a float argument and returns a float result.

Integrity Server Only

tanhl() is a long double version of tanh(); it takes a long double argument and returns a long double result.

tanhw() is an extended version of tanh(); it takes an extended argument and returns an extended result.

tanhq() is equivalent to tanhl() on HP-UX systems.


To use these functions, compile either with the default -Ae option or with the -Aa and the -D_HPUX_SOURCE options.

To use (for Integrity servers) tanhw() or tanhq(), compile also with the -fpwidetypes option.

To use any of these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line.

For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site: http://www.hp.com/go/fp.


tanh(±0) returns ±0.

If x is ±INFINITY, tanh() returns ±1.0 respectively.

If x is NaN, tanh() returns NaN.

Whether tanh() raises the inexact exception is unspecified.


No errors are defined.


tanh() : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

tanhf(), tanhl() : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

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