//-----------------------------------------------------------------------------
//  Programming Assignment #2
//
//  Written by C A Thomas
//  September 2008
//  
//  Purpose:  To calculate the cost of the gasoline, the price of a wash, 
//            the total cost of the gasoline and wash, and the number of    
// 	      discount points earned at the VWC Service Station and Car 
//            Wash.
//-----------------------------------------------------------------------------

//-----------------Proprocessor Section----------------------------------------

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;

//-----------------Main Function-----------------------------------------------

int main ()
{

//----------------Variables and Constants-------------------------------------

  int
       numofdp,			// number of discount points earned      
       numofgalint;             // number of gallons purchase int

  float
       numofgal,		// number of gallons purchase
       costofwash,		// cost of carwash
       costofgas,		// cost of gas
       totalcost;		// total cost of gas and wash
        
  char
      typeofgas;		// regular, premium, or super

//----------------Imput Phase-------------------------------------------------

  cout << "\n\n                Welcome to the VWC Service and Car Wash price program!" ;
  cout << "\n\n     This program is designed to calculate your spendings/earnings at our business!" ;

  cout << "\n\n    Enter grade of gasoline purchased (r for regular, p for premium, and s for super):  	";
  cin >> typeofgas;
  cout << "\n                          Enter Number of gallons purchased:     ";
  cin >> numofgal;  

//----------------Processing Phase--------------------------------------------

  numofgalint = static_cast <int> (numofgal);

  if (numofgalint <= 5)
     costofwash = 6;
   else if (5 < numofgalint && numofgalint < 15)
     costofwash = 6 - ((6 * .1) * (numofgalint - 5)); 
   else if (numofgalint >= 15)
     costofwash = 0;

  if (typeofgas == 'r' || typeofgas == 'R')
     costofgas = 3.399 * numofgal;
   else if (typeofgas == 'p' || typeofgas == 'P')
     costofgas = 3.539 * numofgal;
   else if (typeofgas == 's' || typeofgas == 'S')
     costofgas = 3.679 * numofgal;

  totalcost = costofwash + costofgas;

  if (typeofgas == 'r' || typeofgas == 'R')
      numofdp = 3 * numofgalint;
   else if (typeofgas == 'p' || typeofgas == 'P')
      numofdp = 4 * numofgalint;
   else if (typeofgas == 's' || typeofgas == 'S')
      numofdp = 5 * numofgalint;
    
//----------------Output Phase------------------------------------------------                     
 
  cout << fixed << setprecision(2) ;     // Force fixed point for floats

  cout << "\n\n ~~~~~~~~~~~~Spendings/Earnings Summary~~~~~~~~~~~~~~\n ";

  cout << "\n           Cost of gasoline                      $    " << setw(5) << costofgas;
  cout << "\n           Price of car wash                     $    " << setw(5) << costofwash;
  if (costofwash == 0)
     cout << "  Free";
  cout << "\n           Total cost of gasoline and car wash   $    " << setw(5) << totalcost << endl;
  cout << "\n           Number of discount points earned           " << numofdp << endl;

  return 0;

}