#include <stdio.h>
#include <math.h>
int main()
{

    double pi = 3.14159265358979323846;
    double xdegrees;
    double xradians;

    printf("pi = %.16f\n", pi);
    printf("sin(pi / 6.0) = %f\n", sin(pi / 6.0));
    xdegrees = 30;
/* put a statement here that sets xradians equal to pi/180 times xdegrees */
    printf("sin of %.1f degrees = sin(%f) = %f\n", 
            xdegrees, xradians, sin(xradians));
    return 0;
}