COSH(3M) Mathematical Library Functions COSH(3M)
cosh, coshf, coshl - hyperbolic cosine function
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double cosh(double x);
float coshf(float x);
long double coshl(long double x);
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)
SunOS 5.11 July 12, 2006 COSH(3M)
NAME
cosh, coshf, coshl - hyperbolic cosine function
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double cosh(double x);
float coshf(float x);
long double coshl(long double x);
DESCRIPTION
These functions compute the hyperbolic cosine of their argument x.
RETURN VALUES
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.
ERRORS
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.
USAGE
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.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
SEE ALSO
math.h(3HEAD), acosh(3M), feclearexcept(3M), fetestexcept(3M),
isnan(3M), matherr(3M), sinh(3M), tanh(3M), attributes(7),
standards(7)
SunOS 5.11 July 12, 2006 COSH(3M)