tan, tanf, tanh, tanhf
Visual Studio 2005
Calculate the tangent (tan or tanf) or hyperbolic tangent (tanh or tanhf).
double tan( double x ); float tan( float x ); // C++ only long double tan( long double x ); // C++ only float tanf( float x ); double tanh( double x ); float tanh( float x ); // C++ only long double tanh( long double x ); // C++ only float tanhf( float x );
Parameters
- x
-
Angle in radians.
tan returns 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.
| Input | SEH Exception | Matherr Exception |
|---|---|---|
| ± QNAN,IND | none | _DOMAIN |
| ± ∞ (tan, tanf) | INVALID | _DOMAIN |
tanh returns the hyperbolic tangent of x. There is no error return.
| Routine | Required header | Compatibility |
|---|---|---|
| tan, tanf, tanh, tanhf | <math.h> | ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 |
For additional compatibility information, see Compatibility in the Introduction.
// 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 );
}
Output
tan( 0.785398 ) = 1.000000 tanh( 1.000000 ) = 0.761594
