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atan

Usage

   #include <math.h>
   double atan(double x);

   ANSI

Description

   atan returns the arc tangent of x in the range of -p2 to p2. matherr can
   be used to modify error handling.

Example 

   #include <math.h>
   #include <stdio.h>
   #include <stdlib.h>

   int main()
   {
       double x, y;
       x = 1.0;
       y = atan(x);
       printf("The arc tangent of %.7f is %.7f\n",x,y);
       return EXIT_SUCCESS;
   }

Return Value

   atan returns the arc tangent of its argument.


See Also

   acos, asin, atan2