تابع ‎atan2()‎‎ در ‎C++‎

/* atan2 example */
#include <stdio.h>/* printf */
#include <math.h>/* atan2 */

#define PI 3.14159265

int main ()
{
double x, y, result;
x = -10.0;
y = 10.0;
result = atan2 (y,x) * 180 / PI;
printf ("The arc tangent for (x=%f, y=%f) is %f degreesn", x, y, result );
return 0;
}