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variables and operators: calculating change and display results

Sep 12, 2014 at 4:02am
Pg0715 (49)
hey everyone im stuck on trying to get the change for my program to work I got this all down but I keep getting zero on my change please help
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#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main()
{
  string firstname;
  string lastname;
  string price;
  string paid;
  double amountprice;
  double amountpaid;
  double change;
  double dollar=0;
   double quarters=0;
  double dimes=0;
  double nickels=0;
  double cents=0;
  cout << "Please enter your first name"<< endl;
  cin>>firstname;
  cout << "Please enter your last name"<< endl;
  cin>> lastname;
  cout << " Welcome "<< firstname << " " <<  lastname << endl;
  cout<< "In this program we will see the amount money that is needed to be paid and the change that will be do" << endl;


  //ask user to enter the price and how much money they paid
  cout<<" Please enter the price of the object: $"<< setprecision(2) << fixed << price << endl;
  cin>>amountprice;
  cout<<" Enter the amount that you paid: $"<< setprecision(2) << fixed << paid << endl;
  cin>>amountpaid;
  if (price>paid)
   {
     cout<<"You didnt pay the full amount, pay the full amount or return the item"<<endl;
     return -1;
   }

 change = amountpaid - amountprice;

 cout << "The change for this transaction is: $" << setprecision(2) << fixed << change << endl;

 dollar = change / 1;
 change = change - dollar;

 quarters = change / .25;
 change = change - (quarters * .25);

 dimes = change / .10;
 change = change - (dimes * .10);

 nickels = change / .05;
 change = change - (nickels * .05);

 cents = change / .01;
 change = change - (cents * .01);

 cout << "Dollars:  " << dollar << endl;
 cout << "Quarters: " << quarters << endl;
 cout << "Dimes:    " << dimes << endl;
 cout << "Nickels:  " << nickels << endl;
 cout << "Cents:  " << cents << endl;

 cout << endl;
   return 0;
}
Edit & run on cpp.sh


Last edited on Sep 12, 2014 at 4:08am
Sep 12, 2014 at 6:00am
Yay295 (431)
All of this is wrong:
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dollar = change / 1; // You're dividing by 1...
change = change - dollar; // dollar == change, so this equals 0
// nothing after this matters because it's already zero

quarters = change / .25;
change = change - (quarters * .25);

dimes = change / .10;
change = change - (dimes * .10);

nickels = change / .05;
change = change - (nickels * .05);

cents = change / .01;
change = change - (cents * .01);



Also, on line 33 your are comparing two strings, not two numbers.
Last edited on Sep 12, 2014 at 6:01am
Sep 13, 2014 at 3:39am
Pg0715 (49)
well I did this but doesn't work, when I run it If I put 2.50 for the price it wont run but if I just put 2 it will ask for the amount paid so I don't know whats going on.
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#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main()
{
  string firstname;
  string lastname;
  string price;
  string paid;
  int amountprice;
  int amountpaid;
  int change=0;
  int dollar=0;
  int quarters=0;
  int dimes=0;
  int nickels=0;
  int cents=0;
  cout << "Please enter your first name"<< endl;
  cin>>firstname;
  cout << "Please enter your last name"<< endl;
  cin>> lastname;
  cout << " Welcome "<< firstname << " " <<  lastname << endl;
  cout<< "In this program we will see the amount money that is needed to be paid and the change that will be do" << endl;


  //ask user to enter the price and how much money they paid
  cout<<" Please enter the price of the object: $"<< setprecision(2) << fixed << price << endl;
  cin>>amountprice;
  cout<<" Enter the amount that you paid: $"<< setprecision(2) << fixed << paid << endl;
  cin>>amountpaid;
  if (amountprice>amountpaid)
   {
     cout<<"You didnt pay the full amount, pay the full amount or return the item"<<endl;
     return -1;
   }

 change = amountpaid - amountprice;

 cout << "The change for this transaction is: $" << setprecision(2) << fixed << change << endl;
 change = change*100;
 dollar = change/100;
 quarters=change/25;
 change=change -(quarters *25);
  dimes=change/10;
  change=change-(dimes*10);
 nickels=change/5;
 change=change-(nickels*5);
 cents=change;

 cout << "Dollars:  " << dollar << endl;
 cout << "Quarters: " << quarters << endl;
 cout << "Dimes:    " << dimes << endl;
 cout << "Nickels:  " << nickels << endl;
 cout << "Cents:  " << cents << endl;

 cout << endl;

   return 0;
}
Edit & run on cpp.sh
Sep 13, 2014 at 3:53am
Yay295 (431)
setprecision(2) << fixed << price <<
on lines 29, 31, and 41 does nothing.

All of your number values are integers. http://en.wikipedia.org/wiki/Integer
You should be using float or double.
Sep 13, 2014 at 3:59am
Yay295 (431)
Also:

At the end of line 25, it should be "due" not "do". You also left out the period.
You're missing an apostrophe in "didn't" in line 35. Line 35 is also a comma-splice.
Sep 17, 2014 at 1:22am
Pg0715 (49)
ok well I got this but im not getting it how I want it it gives me the cents but no exactly right
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#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main()
{
  string firstname;
  string lastname;
  string price;
  string paid;
  double amountprice;
  double amountpaid;
  double change;
  double dollar=0.0;
  double quarters=0.0;
  double dimes=0.0;
  double nickels=0.0;
  double cents=0.0;
  cout << "Please enter your first name"<< endl;
  cin>>firstname;
  cout << "Please enter your last name"<< endl;
  cin>> lastname;
  cout << " Welcome "<< firstname << " " <<  lastname << endl;
  cout<< "In this program we will see the amount money that is needed to be\
 paid and the change that will be due" << endl;


  //ask user to enter the price and how much money they paid
  cout<<" Please enter the price of the object: $" << endl;
  cin>>amountprice;
  cout<<" Enter the amount that you paid: $"<< endl;
  cin>>amountpaid;
  if (amountprice>amountpaid)
    {
      cout<<"You didn't pay the full amount, pay the full amount or return \
the item"<<endl;
      return -1;
    }

  cout << "The change for this transaction is: $"<< endl;
  change=amountpaid - amountprice;
 change = change*100;
  dollar = change/100;
  //change=change%100;
  quarters=change/25;
  //change=change%25;
   dimes=change/10;
   //change=change%10;
  nickels=change/5;
  //change=change%5;
  cents=change;

  cout << "Dollars:  " << dollar << endl;
  cout << "Quarters: " << quarters << endl;
  cout << "Dimes:    " << dimes << endl;
  cout << "Nickels:  " << nickels << endl;
  cout << "Cents:  " << cents << endl;

  cout << endl;

  return 0;
}
Edit & run on cpp.sh
Sep 17, 2014 at 1:24am
Pg0715 (49)
this is what I get if I am to run it but its not entirely right and im not getting the change for example the change for this transaction is 1.50

Please enter the price of the object: $
1.50
Enter the amount that you paid: $
3.00
The change for this transaction is: $
Dollars: 1.5
Quarters: 6
Dimes: 15
Nickels: 30
Cents: 150
Sep 17, 2014 at 1:40am
Yay295 (431)
There's no reason to include <iomanip>, you aren't using it. You also aren't using two of your string variables: price and paid.

Your code is doing exactly what you're telling it to do. Try thinking about what it IS doing and what you WANT it to do.
Sep 17, 2014 at 2:35am
Pg0715 (49)
ok I got it thank you I appreciate it
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