C++

Reference

<cmath> (math.h)

function
<cmath> <ctgmath>

tan

double tan (double x);
 double tan (double x); float tanf (float x);long double tanl (long double x);
 double tan (double x); float tan (float x);long double tan (long double x);
 double tan (double x); float tan (float x);long double tan (long double x); double tan (T x); // additional overloads for integral types
Compute tangent
Returns the tangent of an angle of x radians.

Header <tgmath.h> provides a type-generic macro version of this function.
This function is overloaded in <complex> and <valarray> (see complex tan and valarray tan).
Additional overloads are provided in this header (<cmath>) for the integral types: These overloads effectively cast x to a double before calculations (defined for T being any integral type).

This function is also overloaded in <complex> and <valarray> (see complex tan and valarray tan).

Parameters

x
Value representing an angle, expressed in radians.
One radian is equivalent to 180/PI degrees.

Return Value

Tangent of x radians.

Example

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/* tan example */ #include <stdio.h> /* printf */ #include <math.h> /* tan */ #define PI 3.14159265 int main () { double param, result; param = 45.0; result = tan ( param * PI / 180.0 ); printf ("The tangent of %f degrees is %f.\n", param, result ); return 0; }

Output:
 The tangent of 45.000000 degrees is 1.000000.


See also

sin
Compute sine (function)
cos
Compute cosine (function)
atan
Compute arc tangent (function)