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# tan, tanf, tanh, tanhf

Visual Studio 2008

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
);
```
x

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.

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.

Routine

tan, tanf, tanh, tanhf

<math.h>

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 );
}
```
tan( 0.785398 ) = 1.000000 tanh( 1.000000 ) = 0.761594
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