cosh, coshf, coshl, coshd32, coshd64, and coshd128 Subroutines

Purpose

Computes the hyperbolic cosine.

Syntax

#include <math.h>

float coshf (x)
float x;

long double coshl (x)
long double x;

double cosh (x)
double x;
_Decimal32 coshd32 (x)
_Decimal32 x;

_Decimal64 coshd64 (x)
_Decimal64 x;

_Decimal128 coshd128 (x)
_Decimal128 x;

Description

The coshf, coshl, cosh, coshd32, coshd64, and coshd128 subroutines compute the hyperbolic cosine of the x parameter.

An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is nonzero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is nonzero, an error has occurred.

Parameters

Return Values

Upon successful completion, the coshf, coshl, cosh, coshd32, coshd64, and coshd128 subroutines return the hyperbolic cosine of x.

If the correct value would cause overflow, a range error occurs and the coshf, coshl, cosh, coshd32, coshd64, and coshd128 subroutines return the value of the macro HUGE_VALF, HUGE_VALL, HUGE_VAL, HUGE_VAL_D32, HUGE_VAL_D64, and HUGE_VAL_D128 respectively.

If x is NaN, a NaN is returned.

If x is ±0, the value 1.0 is returned.

If x is ±Inf, +Inf is returned.