gistfile1.txt

// Programmer: Jennifer Leopold     date: September 17, 2014
// File: hw4.cpp
// Purpose: Simulate a vending machine that dispenses
//          medications. 
//
// To compile: fg++ hw4.cpp -o hw4
//
// To execute: ./hw4

#include <iostream>    
using namespace std;   

int main()
{
  const float NAPROSYN_COST = 10.0;  // cost of each drug
  const float KRYSTEXXA_COST = 3.5;
  const float SCHRAUT_COST = 4;
  const float XELJANZ_COST = 6.75;
  const float QNASL_COST = 12.25;
  const float GOLYTELY_COST = 14.33;

  const short NAPROSYN_PILLS = 15;   // # pills for each drug
  const short KRYSTEXXA_PILLS = 30;
  const short SCHRAUT_PILLS = 20;    
  const short XELJANZ_PILLS = 5;
  const short QNASL_PILLS = 40;
  const short GOLYTELY_PILLS = 1;

  float cost;                       // customer's charges
  short numPills = 0;               // customer's total pills
  float payment;                    // amount tendered
  bool invalidPayment;              // true if customer doesn't
                                    // enter valid payment

  short pillContainerSize;          // std pill container size
                                    // that customer will need

  short menuChoice;                 // vars associated with
  bool invalidMenuChoice;           // making menu selection

  bool isTimeToQuit = false;        // true when time to 
                                    // terminate program

  do
  {
    // Greet user and get menu selection
    //
    cout << "\nWelcome to the InstyMeds Vending Machine!\n";
    cout << "Here are your choices\n";
    cout << "  1. Naprosyn\n";
    cout << "  2. Krystexxa\n";
    cout << "  3. Schraut!\n";
    cout << "  4. Xeljanz\n";
    cout << "  5. Qnasl Dipropionate\n";
    cout << "  6. GoLytely\n";
    cout << "  7. Quit (shut down the machine)\n";
    do
    {
      cout << "Please make a selection (1-7): ";
      cin >> menuChoice;
      invalidMenuChoice = (menuChoice < 1) || (menuChoice > 7);
      if (invalidMenuChoice)
        cout << "Invalid entry!\n";
    } while (invalidMenuChoice);

    // Determine cost and # pills for selection
    //
    numPills = 0; 
    switch (menuChoice)
    {
      case 1: cost = NAPROSYN_COST;
              numPills = NAPROSYN_PILLS;
              break;
      case 2: cost = KRYSTEXXA_COST;
              numPills = KRYSTEXXA_PILLS;
              break;
      case 3: cost = SCHRAUT_COST;
              numPills = SCHRAUT_PILLS;
              break;
      case 4: cost = XELJANZ_COST;
              numPills += XELJANZ_PILLS;  // will also get 5
      case 5: cost = QNASL_COST;
              numPills += QNASL_PILLS;    // will also get 6
      case 6: cost = GOLYTELY_COST;
              numPills += GOLYTELY_PILLS;
              break;
      case 7: isTimeToQuit= true;
    }

    if (! isTimeToQuit)
    {
      // Prompt user for payment, and then output change
      //
      do 
      {
        cout << "\nYour total is $" << cost << endl;
        cout << "Please enter payment: ";
        cin >> payment;
        invalidPayment = payment < cost;
        if (invalidPayment)
          cout << "That isn't enough!\n";
      } while (invalidPayment);
      cout << "Your change is $" 
           << (payment - cost) << endl;

      // Instruct user to prepare appropriately sized 
      // pill container
      //
      if (numPills <= 10)
        pillContainerSize = 10;
      else if ((numPills > 10) && (numPills <= 25))
        pillContainerSize = 25;
      else if ((numPills > 25) && (numPills <= 50))
        pillContainerSize = 50;
      else if ((numPills > 50) && (numPills <= 100))
        pillContainerSize = 100;
      else
        pillContainerSize = 999;
      cout << "Medications will be dispensed in 30 seconds.\n";
      cout << "You need to have a ";
      if (pillContainerSize <= 100)
        cout << pillContainerSize << " unit pill container";
      else cout << "bucket";
      cout << " ready.\n";
    }
  } while (! isTimeToQuit);

  cout << "\nInstyMeds is shutting down. Goodbye!\n";

  return 0;
}