/* petrol.c */
/* works out miles per gallon, pence per mile etc. */

main()
{
      float cost, miles, pperl, litres;
      
      printf("Hi there, I work out how efficient your car is.\n\n");
      printf("To put in the correct figures, you must first fill your car all\n");
      printf("the way up with fuel and re-set your trip counter.  The next time\n");
      printf("you fill up, again fill up all the way, and note down how much\n");
      printf("fuel you bought in litres, the cost per litre, and how many miles\n");
      printf("you did since your last fill-up.\n\n\n");
      printf("Enter the amount in pounds you spent on fuel: ");
      scanf("%f",&cost);
      printf("What is the cost in pence per litre: ");
      scanf("%f",&pperl);
      printf("And how many miles you did since your last fill-up: ");
      scanf("%f",&miles);
      printf("\n\n\n");
      litres = cost / (pperl/100);
      printf("Your car does %.1f miles to the gallon.\n",miles/(litres * 0.21199));
      printf("Or %.1f miles to the litre.\n",miles/litres);
      printf("It costs you %.2f pence per mile.\n",(cost*100)/miles);
      printf("\n\n(Press any key to exit.)");
      getch();
}