#include<math.h>
int main() {
  double foo=0.0, foo2=0.0, angle=3.14285714/4;
  foo = sin(angle);
  foo2 = sqrt (4);
  printf ("\n Hello World! I also computed Sin (Pi/4) to be: %lf and Square Root (4) to be %lf\n\n", foo, foo2);
}