COSH(3M) | Mathematical Library Functions | COSH(3M) |

cosh, coshf, coshl - hyperbolic cosine function

c99 [flag... ]file...-lm[library... ] #include <math.h>doublecosh(doublex);

floatcoshf(floatx);

long doublecoshl(long doublex);

These functions compute the hyperbolic cosine of their argument
*x*.

Upon successful completion, these functions return the hyperbolic
cosine of *x*.

If the correct value would cause overflow, a range error occurs
and **cosh()**, **coshf()**, and **coshl()** return the value of
the macro **HUGE_VAL**, **HUGE_VALF**, and **HUGE_VALL**,
respectively.

If *x* is NaN, a NaN is returned.

If *x* is ±0, 1.0 is returned.

If *x* is ±Inf, ±Inf is returned.

For exceptional cases, matherr(3M) tabulates the values to
be returned by **cosh()** as specified by SVID3 and XPG3.

These functions will fail if:

**Range Error**

The result would cause an overflow.

If the integer expression (**math_errhandling** &
**MATH_ERREXCEPT**) is non-zero, the overflow floating-point exception is
raised.

The **cosh()** function sets **errno** to **ERANGE** if
the result would cause an overflow.

An application wanting to check for exceptions should call
**feclearexcept**(**FE_ALL_EXCEPT**) before calling these functions.
On return, if **fetestexcept**(**FE_INVALID** | **FE_DIVBYZERO** |
**FE_OVERFLOW** | **FE_UNDERFLOW**) is non-zero, an exception has been
raised. An application should either examine the return value or check the
floating point exception flags to detect exceptions.

An application can also set **errno** to 0 before calling
**cosh()**. On return, if **errno** is non-zero, an error has
occurred. The **coshf()** and **coshl()** functions do not set
**errno**.

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE | ATTRIBUTE VALUE |

Interface Stability | Standard |

MT-Level | MT-Safe |

math.h(3HEAD), acosh(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), matherr(3M), sinh(3M), tanh(3M), attributes(7), standards(7)

July 12, 2006 | SunOS 5.11 |