cosh, coshl

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Header File

math.h

Category

Math Routines

Prototype

double cosh(double x);

long double coshl(long double x);

Description

Calculates the hyperbolic cosine of a value.

cosh computes the hyperbolic cosine:

coshl is the long double version; it takes a long double argument and returns a long double result.

Return Value

cosh returns the hyperbolic cosine of the argument.

When the correct value would create an overflow, these functions return the value HUGE_VAL (cosh) or _LHUGE_VAL (coshl) with the appropriate sign, and the global variable errno is set to ERANGE. Error handling for these functions can be modified through the functions _matherr and _matherrl.

Example

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

Portability

	POSIX	Win32	ANSI C	ANSI C++
cosh	+	+	+	+
coshl		+	+	+