First Time C++ Coder: Need Help With One Little Part (loop)

[mk92595]

For my project, I need to make a program that would ask for a dollar amount for bottles that cost $2 and for every 5 bottles, the user would receive a free bottle until they had less than 5. I got most of it working but for some bottles, it wouldn't output correctly. For example, $68 should return 42 bottles total with 2 left over but it just returns 40 total and 0 left over. I know I need a loop somewhere but i'm not sure where. Any help would be appreciated. My code is below.

//Energy Drinks

#include<iostream>
#include <fstream>

using namespace std;

int main()
  {
    int dollars;
do
{
    int dollars=0;
    int bottle=0;
    int total=0;
    int newcap=0;
    int oldcap=0;
    int leftover=0;
    int change=0;

    cout << "\n";
    cout << "How much money would you like to insert? $";
    cin >> dollars;
    cout << "\n";

    if(dollars==0)
    {
      return 0;
    }

    bottle=dollars/2;
    newcap=bottle/5;
    oldcap=bottle%5;

    if((newcap+oldcap)%5!=0)
    {
      bottle=bottle+(newcap+oldcap)/5;
    }

    if(newcap%5==0)
    {
     newcap=newcap+newcap/5;
    }

    total=bottle+newcap;

    if(dollars%2!=0)
    {
     change=dollars%2;
    }


    cout << "Your total bottle amount is: ";
    cout << total;
    cout << ".\n";

    cout << "Your leftover cap amount is: ";
    cout << total%5;
    cout << ".\n";

    cout << "You have $";
    cout << change;
    cout << " left in change.";
    cout << "\n";

  }while(dollars!=0);

  return 0;
  }

[newbiee999]

Hi!
I am not sure if I understand exactly what you want to do. I have no idea on what you're trying to do after line 34. So I cannot tell you what to fix and how to fix.
However, I can point out some behind the scene work which might help you see why you're getting that unexpected output.

--> Read my comments below, I am showing you the math that is happening behind the scenes.

//Energy Drinks

#include<iostream>
#include <fstream>

using namespace std;

int main()
  {
    int dollars;
do
{
    int dollars=0;
    int bottle=0;
    int total=0;
    int newcap=0;
    int oldcap=0;
    int leftover=0;
    int change=0;

    cout << "\n";
    cout << "How much money would you like to insert? $";
    cin >> dollars;    ///- Input 68, dollars = 68
    cout << "\n";

    if(dollars==0)
    {
      return 0;
    }

    bottle=dollars/2;    ///- bottle = 68/2 = 34
    newcap=bottle/5;     ///- newcap = 34/5 = 6
    oldcap=bottle%5;     ///- oldcap = remOf(34/5) = 4     *** remOf = remainder of = modulus ***

    if((newcap+oldcap)%5!=0)   ///- remOf((6+4)/5) == 0  -- condition false (so don't do anything)
    {
      bottle=bottle+(newcap+oldcap)/5;    
    }

    if(newcap%5==0)     ///- remOf(6/5) != 0 -- condition false (so don't do anything)
    {
     newcap=newcap+newcap/5;
    }

    total=bottle+newcap;    ///- total = 34+6 = 40

    if(dollars%2!=0)       ///- remOf(68/2) == 0   -- condition false (so don't do anything)
    {
     change=dollars%2;
    }


    cout << "Your total bottle amount is: ";
    cout << total;       ///- total = 40 and hence it couts 40
    cout << ".\n";

    cout << "Your leftover cap amount is: ";
    cout << total%5;     ///- remOf(40/5) = 0 and hence it couts 0
    cout << ".\n";

    cout << "You have $";
    cout << change;        ///- value of change remains 0 since you initialized it.
    cout << " left in change.";
    cout << "\n";

  }while(dollars!=0);

  return 0;
  }

[mk92595]

Thank you but I solved it!