tanh, tanhl

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Header File

math.h

Category

Math Routines

Prototype

double tanh(double x);

long double tanhl(long double x);

Description

Calculates the hyperbolic tangent.

tanh computes the hyperbolic tangent, sinh(x)/cosh(x).

tanhl is the long double version; it takes a long double argument and returns a long double result. Error handling for these functions can be modified through the functions _matherr and _matherrl.

Return Value

tanh and tanhl return the hyperbolic tangent of x.

Example

#include <stdio.h>
#include <math.h>
int main(void)
{
   double result, x;
   x = 0.5;
   result = tanh(x);
   printf("The hyperbolic tangent of %lf is %lf\n", x, result);
   return 0;
}

Portability

	POSIX	Win32	ANSI C	ANSI C++
tanh	+	+	+	+
tanhl		+	+	+