/* This program calculates the total cost and miles per gallon
   of a vehicle, based on the miles traveled, fuel consumed,
   cost per gallon of fuel, and operating cost per mile.

   Input: The total miles traveled, total fuel consumed,
          unit cost of the fuel, and operating cost per mile
   Output: The miles per gallon, total cost of the trip,
           and the cost per mile
-------------------------------------------------------------------*/

#include <iostream.h>
#include <iomanip.h>

int main(void)
{
   const int
      Width = 7;                     // width of output field

   cout << "\nPlease enter:\n\tthe total miles traveled,"
        << "\n\tthe gallons of fuel used,"
        << "\n\tthe total cost per gallon of the fuel, and"
        << "\n\tthe operating cost per mile."
        << "\n\t---> ";

   double
      Miles,                         // total miles traveled
      GallonsOfFuel,                 // total gallons used
      UnitFuelCost,                  // fuel cost per gallon
      UnitOperatingCost;             // operating cost per mile

   cin >> Miles >> GallonsOfFuel
       >> UnitFuelCost >> UnitOperatingCost;

   double
      MPG = Miles / GallonsOfFuel,

      TotalFuelCost = UnitFuelCost * GallonsOfFuel,

      TotalOperatingCost = UnitOperatingCost * Miles,

      TotalTripCost = TotalFuelCost + TotalOperatingCost,

      CostPerMile = TotalTripCost / Miles;

   cout << setiosflags(ios::showpoint | ios::fixed)
        << setprecision(2)
        << "\n\tMiles per gallon: " << setw(Width) << MPG
        << "\n\tTotal cost:      $" << setw(Width) << TotalTripCost
        << "\n\tCost per mile:   $" << setw(Width) << CostPerMile
        << "\n\n";

   return 0;
}