Originální popis anglicky:
cosh, coshf, coshl - hyperbolic cosine functions
Návod, kniha: POSIX Programmer's Manual
#include <math.h>
double cosh(double
x);
float coshf(float
x);
long double coshl(long double
x);
These functions shall compute the hyperbolic cosine of their argument
x.
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 non-zero or
fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
non-zero, an error has occurred.
Upon successful completion, these functions shall return the hyperbolic cosine
of
x.
If the correct value would cause overflow, a range error shall occur and
cosh(),
coshf(), and
coshl() shall return the value of
the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.
If
x is NaN, a NaN shall be returned.
If
x is ±0, the value 1.0 shall be returned.
If
x is ±Inf, +Inf shall be returned.
These functions shall fail if:
- Range Error
- The result would cause an overflow.
If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then
errno shall be set to [ERANGE]. If the integer expression
(math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow
floating-point exception shall be raised.
The following sections are informative.
None.
On error, the expressions (math_errhandling & MATH_ERRNO) and
(math_errhandling & MATH_ERREXCEPT) are independent of each other, but at
least one of them must be non-zero.
For IEEE Std 754-1985
double, 710.5 < |
x| implies
that
cosh(
x) has overflowed.
None.
None.
acosh() ,
feclearexcept() ,
fetestexcept() ,
isnan()
,
sinh() ,
tanh() , the Base Definitions volume of
IEEE Std 1003.1-2001, Section 4.18, Treatment of Error
Conditions for Mathematical Functions,
<math.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
