atan

Name

atan, atanf, atanl
- arc tangent function

Library

libm.lib

Synopsis

#include <math.h>

double atan (double x);

float atanf (float x);

long double atan (long double x);
Sh RETURN VALUES The atan, atanf, and the atanl functions return the arc tangent in the range -words [-pi/2, +pi/2]
radians.

Detailed description

The atan and atanf functions compute the principal value of the arc tangent of x. The function atanl is just an alias to the function atan.

Examples

#include <math.h>
int main( )
{
   double x = 1;
   double y = atan( x );
   printf( "atan(%f) = %f\n", x, y );
   y = atanf( x );
   printf( "atanf(%f) = %f\n", x, y );
   y = atanl( x );
   printf( "atanl(%f) = %f\n", x, y ); 
}

Output

atan ( 1.000000 ) = 0.7853981
atanf (1.000000 ) = 0.7853981
atanl(1.000000 ) = 0.7853981

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