<cmath> (math.h)

function
<cmath> <ctgmath>

cosh

double cosh (double x);
     double cosh  (double x);
      float coshf (float x);
long double coshl (long double x);
     double cosh (double x);
      float cosh (float x);
long double cosh (long double x);
     double cosh (double x);
      float cosh (float x);
long double cosh (long double x);
     double cosh (T x);           // additional overloads for integral types
Compute hyperbolic cosine
Returns the hyperbolic cosine of x.

Header <tgmath.h> provides a type-generic macro version of this function.
This function is overloaded in <complex> and <valarray> (see complex cosh and valarray cosh).
Additional overloads are provided in this header (<cmath>) for the integral types: These overloads effectively cast x to a double before calculations (defined for T being any integral type).

This function is also overloaded in <complex> and <valarray> (see complex cosh and valarray cosh).

Parameters

x
Value representing a hyperbolic angle.

Return Value

Hyperbolic cosine of x.
If the magnitude of the result is too large to be represented by a value of the return type, the function returns HUGE_VAL (or HUGE_VALF or HUGE_VALL) with the proper sign, and an overflow range error occurs:

If an overflow range error occurs, the global variable errno is set to ERANGE.
If an overflow range error occurs:
- And math_errhandling has MATH_ERRNO set: the global variable errno is set to ERANGE.
- And math_errhandling has MATH_ERREXCEPT set: FE_OVERFLOW is raised.

Example

1
2
3
4
5
6
7
8
9
10
11
12
/* cosh example */
#include <stdio.h>      /* printf */
#include <math.h>       /* cosh, log */

int main ()
{
  double param, result;
  param = log(2.0);
  result = cosh (param);
  printf ("The hyperbolic cosine of %f is %f.\n", param, result );
  return 0;
}


Output:

The hyperbolic cosine of 0.693147 is 1.250000.

See also