tan


function
<cmath>
     double tan (      double x );
      float tan (       float x );
long double tan ( long double x );

Compute tangent

Returns the tangent of an angle of x radians.

In C++, this function is overloaded in <complex> and <valarray> (see complex tan and valarray tan).

Parameters

x
Floating point value representing an angle expressed in radians.


Return Value

Tangent of x.

Portability

In C, only the double version of this function exists with this name.

Example

1
2
3
4
5
6
7
8
9
10
11
12
13
14
/* tan example */
#include <stdio.h>
#include <math.h>

#define PI 3.14159265

int main ()
{
  double param, result;
  param = 45.0;
  result = tan (param*PI/180);
  printf ("The tangent of %lf degrees is %lf.\n", param, result );
  return 0;
}


Output:

The tangent of 45.000000 degrees is 1.000000.


See also