float coshf( float arg );
(1) (since C99)double cosh( double arg );
(2)long double coshl( long double arg );
(3) (since C99)#define cosh( arg )
(4) (since C99)1-3) Computes the hyperbolic cosine of arg.
Type-generic macro: If the argument has type
long double,
coshl
is called. Otherwise, if the argument has integer type or the type
double,
cosh
is called. Otherwise,
coshf
is called. If the argument is complex, then the macro invokes the corresponding complex function (
ccoshf,
ccosh,
ccoshl).
[edit] Parameters arg - floating-point value representing a hyperbolic angle [edit] Return valueIf no errors occur, the hyperbolic cosine of
arg
(
cosh(arg), or
) is returned.
If a range error due to overflow occurs, +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL is returned.
Errors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559),
For the IEEE-compatible type double, if |arg| > 710.5, then cosh(arg) overflows.
#include <errno.h>
#include <fenv.h>
#include <math.h>
#include <stdio.h>
// #pragma STDC FENV_ACCESS ON
int main(void)
{
printf("cosh(1) = %f\ncosh(-1)= %f\n", cosh(1), cosh(-1));
printf("log(sinh(1) + cosh(1))=%f\n", log(sinh(1) + cosh(1)));
// special values
printf("cosh(+0) = %f\ncosh(-0) = %f\n", cosh(0.0), cosh(-0.0));
// error handling
errno = 0;
feclearexcept(FE_ALL_EXCEPT);
printf("cosh(710.5) = %f\n", cosh(710.5));
if (errno == ERANGE)
perror(" errno == ERANGE");
if (fetestexcept(FE_OVERFLOW))
puts(" FE_OVERFLOW raised");
}
Possible output:
cosh(1) = 1.543081
cosh(-1)= 1.543081
log(sinh(1) + cosh(1))=1.000000
cosh(+0) = 1.000000
cosh(-0) = 1.000000
cosh(710.5) = inf
errno == ERANGE: Numerical result out of range
FE_OVERFLOW raised[edit] References
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