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tan, tanf, tanh, tanhf

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

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.

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

Required header

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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