std::tanh, std::tanhf, std::tanhl

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< cpp‎ | numeric‎ | math
 
 
 
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tanh
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Defined in header <cmath>
(1)
float       tanh ( float arg );
float       tanhf( float arg );
(since C++11)
double      tanh ( double arg );
(2)
(3)
long double tanh ( long double arg );
long double tanhl( long double arg );
(since C++11)
double      tanh ( IntegralType arg );
(4) (since C++11)
1-3) Computes the hyperbolic tangent 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 tangent of arg (tanh(arg), or
earg
-e-arg
earg
+e-arg
) is returned.

If a range error occurs due to underflow, the correct result (after rounding) 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, ±0 is returned
  • If the argument is ±∞, ±1 is returned
  • if the argument is NaN, NaN is returned

Notes

POSIX specifies that in case of underflow, arg is returned unmodified, and if that is not supported, and implementation-defined value no greater than DBL_MIN, FLT_MIN, and LDBL_MIN is returned.

Examples

#include <iostream>
#include <cmath>
 
int main()
{
    std::cout << std::showpos
              << "tanh(+1) = " << std::tanh(+1) << '\n'
              << "tanh(-1) = " << std::tanh(-1) << '\n'
              << "tanh(0.1)*sinh(0.2)-cosh(0.2) = "
              << std::tanh(0.1) * std::sinh(0.2) - std::cosh(0.2) << '\n'
              // special values:
              << "tanh(+0) = " << std::tanh(+0.0) << '\n'
              << "tanh(-0) = " << std::tanh(-0.0) << '\n';
}

Output:

tanh(+1) = +0.761594
tanh(-1) = -0.761594
tanh(0.1)*sinh(0.2)-cosh(0.2) = -1
tanh(+0) = +0
tanh(-0) = -0

See also

(C++11)(C++11)
computes hyperbolic sine (sinh(x))
(function)
(C++11)(C++11)
computes hyperbolic cosine (cosh(x))
(function)
(C++11)(C++11)(C++11)
computes the inverse hyperbolic tangent (artanh(x))
(function)
computes hyperbolic tangent of a complex number (tanh(z))
(function template)
applies the function std::tanh to each element of valarray
(function template)