tan, tanf, tanh, tanhf
Visual Studio .NET 2003
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.
Return Value
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.
Remarks
C++ allows overloading, so users can call overloads of tan and tanh that take float or long double types. In a C program, the tan and tanh functions always take and return double.
Requirements
| Routine | Required header | Compatibility |
|---|---|---|
| tan, tanf, tanh, tanhf | <math.h> | ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
All versions of the C run-time libraries.
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 );
}
Output
tan( 0.785398 ) = 1.000000 tanh( 1.000000 ) = 0.761594
See Also
Floating-Point Support Routines | Long Double Routines | acos | asin | atan | cos | sin | Run-Time Routines and .NET Framework Equivalents
