tan, tanf, tanl, tanh, tanhf, tanhl

[アーティクル]
12/18/2017

The latest version of this topic can be found at tan, tanf, tanl, tanh, tanhf, tanhl.

Calculates the tangent (tan, tanf, or tanl), or hyperbolic tangent (tanh, tanhf, or tanhl).

Syntax

double tan(  
   double x   
);  
float tan(  
   float x   
);  // C++ only  
long double tan(  
   long double x  
);  // C++ only  
float tanf(  
   float x   
);  
long double tanl(  
   long double x  
);  
double tanh(  
   double x   
);  
float tanh(  
   float x   
);  // C++ only  
long double tanh(  
   long double x  
);  // C++ only  
float tanhf(  
   float x   
);  
long double tanhl(  
   long double x  
);

Parameters

x
Angle in radians.

Return Value

The tan functions return the tangent of x. If x is greater than or equal to 263, or less than or equal to –263, a loss of significance in the result occurs.

The tanh functions return the hyperbolic tangent of x. There is no error return.

Input	SEH Exception	`Matherr` Exception
± QNAN,IND	none	_DOMAIN
± ∞ (`tan`, `tanf`)	`INVALID`	_DOMAIN

Remarks

Because C++ allows overloading, you can call overloads of tan and tanh that take and return float or long double values. In a C program, tan and tanh always take and return double.

Requirements

Routine	Required header
`tan`, `tanf`, `tanl`, `tanh`, `tanhf`, `tanhl`	<math.h>

For additional compatibility information, see Compatibility.

Example

// crt_tan.c  
// This program displays the tangent of pi / 4  
// and the hyperbolic tangent of the result.  
//  
  
#include <math.h>  
#include <stdio.h>  
  
int main( void )  
{  
   double pi = 3.1415926535;  
   double x, y;  
  
   x = tan( pi / 4 );  
   y = tanh( x );  
   printf( "tan( %f ) = %f\n", pi/4, x );  
   printf( "tanh( %f ) = %f\n", x, y );  
}

tan( 0.785398 ) = 1.000000  
tanh( 1.000000 ) = 0.761594

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