#include <stdio.h>
int main(void){
  int    n=3;
  double x=1.2; 
  printf("Hello \t World!\n");
  printf("Hello n=%d and x=%f  %s!\n", n,  x, "Earthlings");
  // Comment ends at end of line!
  /*  
  Multiple Line Comments
  */
  return 0;
}