I'm Stuck Help

verdell32 · 11-01-2004, 03:12 PM

I am working in Borland C++ 5 and these are the specifications:

Write a program that inputs the amount of a sale and an amount tendered by a customer. The program should then calculate the total amount of change due and display the same. Then the program should calculate the individual bills and coins that would be used to give change back to a customer.

Sample output: Another example:

Amount tendered : $200.00
Amount of sale : $121.62
Your total change: $ 78.38
--------------------------------- -----------------------------------
1 fifty
1 twenty
0 tens
1 five
3 ones
0 half dollars
1 quarter
1 dime
0 nickels
3 pennies

Thanks for all your help.
Here's what I have so far:

Code:

// Program Documentation //////////////////////////////////////////////////////
//
// Project Name  : CHANGE
//
// Source File   : change.cpp
//
// Programmed By :Shang Fields
//
// Last Revision : 11/1/2004
//
// Version Number: 0.1
//
// Program Description ////////////////////////////////////////////////////////
//
// This program the user inputs the amount of a sale and an amount tendered
// by customer. Then the program will calculate the individual bills
// and coins that will be used to give change back to the customer.
///////////////////////////////////////////////////////////////////////////////

// Include Files //////////////////////////////////////////////////////////////
#include <iostream.h>
#include <conio.h>

// Function Prototypes ////////////////////////////////////////////////////////

// Program Mainline ///////////////////////////////////////////////////////////

int main( )
{
   //-- Define a fifty,twenty,tens,five,ones,halfadollar, quarter, dime and nickel in terms of pennies.
   static const unsigned PENNIES_IN_FIFTY = 50;
   static const unsigned PENNIES_IN_TWENTY = 20;
   static const unsigned PENNIES_IN_TENS = 10;
   static const unsigned PENNIES_IN_FIVE = 5;
   static const unsigned PENNIES_IN_ONES = 1;
	static const unsigned PENNIES_IN_HALFDOLLARS = 50;
	static const unsigned PENNIES_IN_QUQARTERS = 25;
	static const unsigned PENNIES_IN_DIMES = 10;
	static const unsigned PENNIES_IN_NICKELS = 5;
   float total_in_cents;
   float amountTendered;
   float amountOfSale;
   float totalChange;

   //Input data
   cout<<"Enter amount tendered:";
   cin>>amountTendered;
   cout<<"Enter amount of sale:";
   cin>>amountOfSale;
   cout>>totalChange;


   //Calculations
   fifty = total_in_cents / PENNIES_IN_FIFTY;
   total_in_cents -= fifty * PENNIES_IN_FIFTY;
   twenty = total_in_cents / PENNIES_IN_TWENTY;
   total_in_cents -= twenty * PENNIES_IN_TWENTY;
   tens = total_in_cents / PENNIES_IN_TENS;
   total_in_cents -= tens * PENNIES_IN_TENS;
   five = total_in_cents / PENNIES_IN_FIVE;
   total_in_cents -= five * PENNIES_IN_FIVE;
   ones = total_in_cents / PENNIES_IN_ONES;
   total_in_cents -= ones * PENNIES_IN_ONES;
   halfdollars = total_in_cents / PENNIES_IN_HALFDOLLARS;
   total_in_cents -= halfdollars * PENNIES_IN_HALFDOLLARS;
   quarters = total_in_cents / PENNIES_IN_QUQARTERS;
   total_in_cents -= quarters * PENNIES_IN_QUQARTERS;
   dimes = total_in_cents / PENNIES_IN_DIMES;
   total_in_cents -= dimes * PENNIES_IN_DIMES;
   nickels = total_in_cents / PENNIES_IN_NICKELS;
   pennies = total_in_cents - nickels * PENNIES_IN_NICKELS;
   totalChange = amountTendered - amountOfSale;
   
   cout<<endl;
   cout<< "\t\tAmount expressed in terms of change:" << endl;
   cout<< "\t\t\t" << fifty << " fifty" << endl;
   cout<< "\t\t\t" << twenty << " twenty" << endl;
   cout<< "\t\t\t" << tens << " tens" << endl;
   cout<< "\t\t\t" << five << " five" << endl;
   cout<< "\t\t\t" << ones << " ones" << endl;
   cout<< "\t\t\t" << halfdollars << "halfdollars" << endl;
   cout<< "\t\t\t" << quarters << " quarters" << endl;
   cout<< "\t\t\t" << dimes << " dimes" << endl;
   cout<< "\t\t\t" << nickels << " nickels" << endl;
   cout<< "\t\t\t" << pennies << " pennies" << endl<<endl;
   cout<<endl;

   getch();
   return 0;
}//endmn

:p

Valmont · 11-01-2004, 09:04 PM

As promised, the code below:

Code:

#include <iostream>
#include <string>
#include <climits>
#include <fstream>

using std::cin;
using std::cout;
using std::numeric_limits;
using std::streamsize;
using std::string;
using std::endl;
using std::ifstream;

//Optional function: depends on IDE. Prevents from "console flashing".
//1) Remove if not needed by IDE. 2) Remove for final release.
void wait_for_enter();

//Additional helper.
void reset_istream();

//-- Define the monetary system in terms of pennies.
static const unsigned PENNIES_IN_FIFTY = 5000;
static const unsigned PENNIES_IN_TWENTY = 2000;
static const unsigned PENNIES_IN_TEN = 1000;
static const unsigned PENNIES_IN_FIVE = 500;
static const unsigned PENNIES_IN_DOLLAR = 100;
static const unsigned PENNIES_IN_HALF_DOLLARS = 50;
static const unsigned PENNIES_IN_QUQARTERS = 25;
static const unsigned PENNIES_IN_DIMES = 10;
static const unsigned PENNIES_IN_NICKELS = 5;

//A little cheat: otherwise such as 200.01 - 50.02 differs with 1 cent.
static const double TOLERANCE = 0.00000000001;

//Outcomment ONE of these two preprocessors to enable a calculation method.
#define MODULUS_METHOD
//#define STRAIGTFORWARD_METHOD

int main(int argc, char *argv[])
{
   unsigned fifties, twenties, tens, fives, dollars, halvedollars ,
      quarters, nickels, dimes, pennies;
   double total_change(0), amount_tendered(0), amount_of_sale(0);

   cout<<"Enter amount of sale (format: dd.cc): ";
   while( !(cin>>amount_of_sale) || amount_of_sale < 0.01 )
   {
      cout<<endl;
      cout<<"ERROR! invalid input. Requirements for valid input follows below:"<<endl;
      cout<<"1) Enter only floating point values."<<endl;
      cout<<"2) Floating point value must be > 0."<<endl;
      cout<<"\nTry again please. Enter amount of sale (format: dd.cc): ";
      reset_istream();
   }
   
   cout<<"Enter amount tendered (format: dd.cc): ";
   while( !(cin>>amount_tendered) || amount_tendered < 0.01 || amount_tendered < amount_of_sale )
   {
      cout<<endl;
      cout<<"ERROR! invalid input. Requirements for valid input follows below:"<<endl;
      cout<<"1) Enter only floating point values."<<endl;
      cout<<"2) Floating point value must be > 0."<<endl;
      cout<<"3) Amount tendered must be => amount of sale."<<endl;
      cout<<"\nTry again please. Enter mount tendered (format: dd.cc): ";
      reset_istream();
   }

   total_change =  amount_tendered - amount_of_sale;
   //Lets prevent multiple casts by converting the amount to cents only.
   unsigned total_in_cents;
   total_in_cents = (unsigned)(total_change * 100 + TOLERANCE);

   //Start calculating: offering two approaches (methods).

#ifdef MODULUS_METHOD
   //METHOD TYPE: modulus calcualtion. Fast (more or less).
   cout<<"\n*** using MODULUS_METHOD ***"<<endl;

   fifties = total_in_cents / PENNIES_IN_FIFTY;
   total_in_cents %= PENNIES_IN_FIFTY;

   twenties = total_in_cents / PENNIES_IN_TWENTY;
   total_in_cents %= PENNIES_IN_TWENTY;
   
   tens = total_in_cents / PENNIES_IN_TEN;
   total_in_cents %= PENNIES_IN_TEN;
   
   fives = total_in_cents / PENNIES_IN_FIVE;
   total_in_cents %= PENNIES_IN_FIVE;
   
   dollars = total_in_cents / PENNIES_IN_DOLLAR;
   total_in_cents %=  PENNIES_IN_DOLLAR;
   
   halvedollars = total_in_cents / PENNIES_IN_HALF_DOLLARS;
   total_in_cents %= PENNIES_IN_HALF_DOLLARS;
   
   quarters = total_in_cents / PENNIES_IN_QUQARTERS;
   total_in_cents %=  PENNIES_IN_QUQARTERS;

   dimes = total_in_cents / PENNIES_IN_DIMES;
   total_in_cents %= PENNIES_IN_DIMES;

   nickels = total_in_cents / PENNIES_IN_NICKELS;
   pennies = total_in_cents % PENNIES_IN_NICKELS;
#endif //MODULUS_METHOD

#ifdef STRAIGTFORWARD_METHOD
   //METHOD TYPE: straight forward. Needs additional calculation per type to determine leftover.
   cout<<"\n*** using STRAIGHTFORWARD_METHOD ***"<<endl;

   fifties = total_in_cents / PENNIES_IN_FIFTY;
   total_in_cents -= fifties * PENNIES_IN_FIFTY;
   
   twenties = total_in_cents / PENNIES_IN_TWENTY;
   total_in_cents -= twenties * PENNIES_IN_TWENTY;
   
   tens = total_in_cents / PENNIES_IN_TEN;
   total_in_cents -= tens * PENNIES_IN_TEN;
   
   fives = total_in_cents / PENNIES_IN_FIVE;
   total_in_cents -= fives * PENNIES_IN_FIVE;

   dollars = total_in_cents / PENNIES_IN_DOLLAR;
   total_in_cents -= dollars * PENNIES_IN_DOLLAR;
   
   halvedollars = total_in_cents / PENNIES_IN_HALF_DOLLARS;
   total_in_cents -= halvedollars * PENNIES_IN_HALF_DOLLARS;
   
   quarters = total_in_cents / PENNIES_IN_QUQARTERS;
   total_in_cents -= quarters * PENNIES_IN_QUQARTERS;
   
   dimes = total_in_cents / PENNIES_IN_DIMES;
   total_in_cents -= dimes * PENNIES_IN_DIMES;
   
   nickels = total_in_cents / PENNIES_IN_NICKELS;
   pennies = total_in_cents - nickels * PENNIES_IN_NICKELS;
#endif //STRAIGHTFORWARD_METHOD

   cout<<endl;
   cout<<"Amount of sale: $"<<amount_of_sale<<endl;
   cout<<"Amount tendered: $"<<amount_tendered<<endl;
   cout<<"Your total change $"<<total_change<<endl;
   cout<<endl;
   cout<< "\t\tAmount expressed in terms of change:" << endl;
   cout<< "\t\t\t" << fifties << " fifties" << endl;
   cout<< "\t\t\t" << twenties << " twenties" << endl;
   cout<< "\t\t\t" << tens << " tens" << endl;
   cout<< "\t\t\t" << fives << " fives" << endl;
   cout<< "\t\t\t" << dollars << " dollars" << endl;
   cout<< "\t\t\t" << halvedollars << " half-dollars" << endl;
   cout<< "\t\t\t" << quarters << " quarters" << endl;
   cout<< "\t\t\t" << dimes << " dimes" << endl;
   cout<< "\t\t\t" << nickels << " nickels" << endl;
   cout<< "\t\t\t" << pennies << " pennies" << endl<<endl;

   //These two functions co-operate together. If not needed by IDE, then remove both calls.
   reset_istream();
   wait_for_enter();
   return 0;
}


//---------------------------------------------------

void reset_istream()
{
   if(cin.eof())
   {
      cin.clear();
   }
   else
   {
      cin.clear();
      cin.ignore(numeric_limits<streamsize>::max(), '\n');
   }
}

//---------------------------------------------------

void wait_for_enter()
{
  cout << "press <enter> to continue...";
  // Reset failstate, just in case.
  cin.clear();
  string line;
  getline( cin, line);
}

verdell32 · 11-02-2004, 02:06 PM

I thank you for your help.