cosh, coshf, coshl

Header: <math.h>

1-3) Computes the hyperbolic cosine of arg.

# Declarations

float coshf( float arg );

(since C99)

double cosh( double arg );

long double coshl( long double arg );

(since C99)

#define cosh( arg )

(since C99)

# Parameters

# Return value

If a range error due to overflow occurs, +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL is returned.

# Notes

For the IEEE-compatible type double, if |arg| > 710.5, then cosh(arg) overflows.

# Example

#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");
}

# See also