tan, tanl

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Header File

math.h

Category

Math Routines

Prototype

double tan(double x);

long double tanl(long double x);

Description

Calculates the tangent.

tan calculates the tangent. Angles are specified in radians.

tanl is the long double version; it takes a long double argument and returns a long double result. Error handling for these routines can be modified through the functions _matherr and _matherrl.

Return Value

tan and tanl return the tangent of x, sin(x)/cos(x).

Example

#include <stdio.h>
#include <math.h>
int main(void)
{
   double result, x;
   x = 0.5;
   result = tan(x);
   printf("The tan of %lf is %lf\n", x, result);
   return 0;
}

Portability

	POSIX	Win32	ANSI C	ANSI C++
tan	+	+	+	+
tanl		+	+	+