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tanh, tanhf, tanhl

Defined in header <math.h> 
float       tanhf( float arg );
-		 (1) (since C99) 
double      tanh( double arg );
-		 (2) 
long double tanhl( long double arg );
-		 (3) (since C99)
Defined in header <tgmath.h> 
#define tanh( arg )
-		 (4) (since C99)
-1-3) Computes the hyperbolic tangent of arg.
-4) Type-generic macro: If the argument has type long double, tanhl is called. Otherwise, if the argument has integer type or the type double, tanh is called. Otherwise, tanhf is called. If the argument is complex, then the macro invokes the corresponding complex function (ctanhf, ctanh, ctanhl).

Parameters

- -
arg - floating point value representing a hyperbolic angle

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),

-

Notes

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

-

Example

#include <stdio.h>
-#include <math.h>
- 
-int main(void)
-{
-    printf("tanh(1) = %f\ntanh(-1) = %f\n", tanh(1), tanh(-1));
-    printf("tanh(0.1)*sinh(0.2)-cosh(0.2) = %f\n", tanh(0.1) * sinh(0.2) - cosh(0.2));
-    // special values
-    printf("tanh(+0) = %f\ntanh(-0) = %f\n", tanh(0.0), tanh(-0.0));
-}

Output:

-
tanh(1) = 0.761594
-tanh(-1) = -0.761594
-tanh(0.1)*sinh(0.2)-cosh(0.2) = -1.000000
-tanh(+0) = 0.000000
-tanh(-0) = -0.000000

References

See also

- - - - -
-
(C99)(C99)
 computes hyperbolic sine (\({\small\sinh{x} }\)sinh(x))
(function)
-
(C99)(C99)
 computes hyperbolic cosine (\({\small\cosh{x} }\)cosh(x))
(function)
-
(C99)(C99)(C99)
 computes inverse hyperbolic tangent (\({\small\operatorname{artanh}{x} }\)artanh(x))
(function)
-
(C99)(C99)(C99)
 computes the complex hyperbolic tangent
(function)
C++ documentation for tanh
-

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Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/numeric/math/tanh -

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