// ---------------------------------------------------------------------
// Program # 2 - The VWC Sevice Station and Car Wash
//
// Written by Caitlin Hansen
// September 2008
//
// Purpose: To calculate the cost of the gasoline, the price of a wash, 
// the total cost for the gasoline and car wash, and the number of 
// discount points earned.
//----------------------------------------------------------------------

// ------ Preprocessor Section ------

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

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

int main ()
{

// ------ Variables and Constants

   int
      discpts;          // the number of discount points earned
 
   float
      R,                // the price of a gallon of the regular (R) gasoline 
      P,                // the price of a gallon of the premium (P) gasoline
      S,                // the price of a gallon of the premium (S) gasoline
      gasamt,           // the amount of gallons of gasoline pumped
      discwash,         // the discounted price of the car wash
      orgwash,          // the orginial price of the car wash
      amtspent,         // the amount spent on the gallons of gasoline
      totcost;          // the total cost of the gas and car wash

   char
      gastype;    // the type of gasoline bought, R, P, or S

// ------ Input Phase

   cout << endl;
   cout << "Welcome to the VWC Service Station Analysis Program!";
   cout << endl;
   cout << endl;
   cout << "Enter the type of gasoline pumped (R for regular, P for premium, or S for super) --------> ";
   cin >> gastype;
   cout << endl;
   cout << "Enter the amount of gasoline pumped ------> ";
   cin >> gasamt;
   cout << endl;
   cout << endl;

// ------ Processing Phase

orgwash = 6.00;

if(gasamt <= 5)
   discwash = orgwash;

 else if(gasamt <= 6)
   discwash = orgwash - (0.10 * orgwash);

 else if(gasamt <= 7)
   discwash = orgwash - (0.20 * orgwash);

 else if(gasamt <= 8)
   discwash = orgwash - (0.30 * orgwash);

 else if(gasamt <= 9)
   discwash = orgwash - (0.40 * orgwash);

 else if(gasamt <= 10)
   discwash = orgwash - (0.50 * orgwash);

 else if(gasamt <= 11)
   discwash = orgwash - (0.60 * orgwash);

 else if(gasamt <= 12)
   discwash = orgwash - (0.70 * orgwash);

 else if(gasamt <= 13)
   discwash = orgwash - (0.80 * orgwash);

 else if(gasamt <= 14)
   discwash = orgwash - (0.90 * orgwash);

 else
   discwash = 0.00;

if(gastype == 'R' || gastype == 'r')
   amtspent = gasamt * 3.399;

 else if(gastype == 'P' || gastype == 'p')
   amtspent = gasamt * 3.539;

 else
   amtspent = gasamt * 3.679;

totcost = amtspent + discwash;
 
if(gastype == 'R' || gastype == 'r')
   discpts = static_cast<int>(gasamt) * 3;

 else if(gastype == 'P' || gastype == 'p')
   discpts = static_cast<int>(gasamt) * 4;

 else if(gastype == 'S' || gastype == 's')
   discpts = static_cast<int>(gasamt) * 5;

// ------ Output Phase

   cout << fixed;             // force fixed point format for floats

   cout << "         *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*";
   cout << endl;
   cout << "         *~*~*~*~*~* VWC Service Station Savings Summary *~*~*~*~*~*~*";
   cout << endl;
   cout << "         *~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*";
   cout << endl;
   cout << endl;
   
   cout << setprecision(2);  // four decimal digit for floats
   
   cout << "                Gasoline Pumped:                         " << gasamt; 
   cout << endl;
   cout << endl;
   
   cout << "                Type of Gasoline:                        ";
 if(gastype == 'R' || gastype == 'r')
   cout << "Regular";
  else if(gastype == 'P' || gastype == 'p')
   cout << "Premium";
  else
   cout << "Super";  
   cout << endl;
   cout << endl;  
   cout << "                Amount Spent on Gasoline:                " << amtspent;
   cout << endl;
   cout << endl;     
  
   cout << "                Price of Discounted Car Wash:         $  " << discwash;
 if(discwash == 0)
   cout << "   It's FREE!";
   cout << endl;
   cout << endl;
  
   cout << "                Total Cost of Gasoline and Car Wash:  $  " << totcost;
   cout << endl;
   cout << endl;
  
   cout << "                Amount of Discount Points Earned:        " << discpts; 
   cout << endl;
   cout << endl;
    if(discpts >= 1)  
  {cout << "                        Congratulations!";
   cout << endl;
   cout << endl;
   cout << "     ***You've earned discount points with yours purchases today";
   cout << endl;
   cout << "        These points may be used towards purchases not only in the";
   cout << endl;
   cout << "        service station, but the adjacent convenience store as well!***";
   cout << endl;
}
return 0;
}