/* File: hello3.c

   More about Marvin and Earth.
*/


#include <stdio.h>


main() {

int dm ;     // dm is an integer variable
double pi ;  // pi is a floating point variable

   printf("Hello World\n") ;
   printf("My name is Marvin the Paranoid Android.") ;  // no \n
   printf("I have brains the size of a planet.\n") ;

   dm = 7926 ;
   pi = 3.14159265 ;

   printf("\n\nHow big is that?\n") ;
   printf("The planet Earth has a diameter of %d miles at the equator\n", dm) ;
   printf("Which means the circumference of earth is about %f miles at the equator.\n",
      dm * pi ) ; 

   printf("\n") ;
   printf("\n") ;

   printf("That's pretty big!\n") ;

   /* comments can go anywhere */
   // single line comments using double slashes.
   
   printf("\n\nTo might find me (Marvin) working at Milliways") ; 
   printf("(the Restaurant at the End of the Universe).\n") ;

   // Here 'End' refers to time, not location.

}