std::cosh,std::coshf,std::coshl (3) - Linux Manuals

std::cosh,std::coshf,std::coshl: std::cosh,std::coshf,std::coshl

NAME

std::cosh,std::coshf,std::coshl - std::cosh,std::coshf,std::coshl

Synopsis

Defined in header <cmath>
float cosh ( float arg );
float coshf( float arg ); (since C++11)
double cosh ( double arg ); (1) (2)
long double cosh ( long double arg );
long double coshl( long double arg ); (3) (since C++11)
double cosh ( IntegralType arg ); (4) (since C++11)

1-3) Computes the hyperbolic cosine of arg
4) A set of overloads or a function template accepting an argument of any integral_type. Equivalent to 2) (the argument is cast to double).

Parameters

arg - value of a floating-point or Integral_type

Return value

If no errors occur, the hyperbolic cosine of arg (cosh(arg), or

earg
+e-arg
2

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

Error handling

Errors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559),

* if the argument is ±0, 1 is returned
* If the argument is ±∞, +∞ is returned
* if the argument is NaN, NaN is returned

Notes

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

Example

  #include <iostream>
  #include <cmath>
  #include <cerrno>
  #include <cstring>
  #include <cfenv>

  #pragma STDC FENV_ACCESS ON
  int main()
  {
      std::cout << "cosh(1) = " << std::cosh(1) << '\n'
                << "cosh(-1) = " << std::cosh(-1) << '\n'
                << "log(sinh(1)+cosh(1)=" << std::log(std::sinh(1)+std::cosh(1)) << '\n';
      // special values
      std::cout << "cosh(+0) = " << std::cosh(0.0) << '\n'
                << "cosh(-0) = " << std::cosh(-0.0) << '\n';
      // error handling
      errno=0;
      std::feclearexcept(FE_ALL_EXCEPT);
      std::cout << "cosh(710.5) = " << std::cosh(710.5) << '\n';
      if (errno == ERANGE)
          std::cout << " errno == ERANGE: " << std::strerror(errno) << '\n';
      if (std::fetestexcept(FE_OVERFLOW))
          std::cout << " FE_OVERFLOW raised\n";
  }