C Reference function atan()
Usage of atan():
double atan(double x);
Parameters:
The value of x has no range.
Return value:
The returned value is in the range of -p/2 to +p/2 (inclusive).
Source code example of atan():
#include<stdio.h>
#include<math.h>
#define PI 3.14159265
main()
{
double input, output;
input = 0.5;
output = atan (input) * 180 / PI;
printf ("Arc tangent of %lf is %lf degrees\n", input, output );
return 0;
}
Output of the atan example program above:
Arc tangent of 0.500000 is 26.565051 degrees.
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