tan, tanf, tanl, tanh, tanhf, tanhl
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Calculates the tangent (tan, tanf, or tanl), or hyperbolic tangent (tanh, tanhf, or tanhl).
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.
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 |
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.
| Routine | Required header |
|---|---|
tan, tanf, tanl, tanh, tanhf, tanhl | <math.h> |
For additional compatibility information, see Compatibility.
// 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
Floating-Point Support
Long Double
acos, acosf, acosl
asin, asinf, asinl
atan, atanf, atanl, atan2, atan2f, atan2l
cos, cosf, cosl, cosh, coshf, coshl
sin, sinf, sinl, sinh, sinhf, sinhl
_CItan