Thread: C++ Cash Register Help

I am building a program as a cash register that uses rocks, stones, and pebbles as currency. I seem to be having problems converting/getting change. This is more of an arithmetic problem rather than a crash or error but if anyone could help out I'd appreciate it.

Below the code I put some examples.

Code:

#include <iostream>#include <string>
#include <iomanip>


const int PEBBLES_PER_ROCK = 25;
const int PEBBLES_PER_STONE = 5;


const int COST_COFFEE = 27;
const int COST_DONUT = 23;


using namespace std;


int main () {


    int coffee = 0,
        donuts = 0,
        rocks = 0,
        stones = 0,
        pebbles = 0;


    int totalPrice = 0,
        totalPayment = 0,
        totalChange = 0,
        totalRocks = 0,
        totalStones = 0,
        totalPebbles = 0; 


    int changeRocks = 0,
        changeStones = 0,
        changePebbles = 0;
    
    char junk;


    cout << "Enter your order => " << endl;
    cin >> coffee >> junk >> donuts >> junk >> rocks >> junk        
        >> stones >> junk >> pebbles;


    cout << "Cups of Coffee: " << coffee << endl;
         
    cout << "Donuts Purchased: " << donuts << endl;


    totalPrice = coffee * COST_COFFEE + donuts * COST_DONUT;
    totalRocks = totalPrice / PEBBLES_PER_ROCK;
    totalPrice = totalPrice %= PEBBLES_PER_ROCK;


    totalStones = totalPrice / PEBBLES_PER_STONE;
    totalPrice = totalPrice %= PEBBLES_PER_STONE;
 
    totalPebbles = totalPrice;


    cout << "Total Bill: " << totalRocks << " rocks "
         << totalStones << " stones " << totalPebbles << " pebbles " << endl;


    cout << "Cash tendered: " << rocks << " rocks " << stones << " stones "
         << pebbles << " pebbles " << endl;
    
    totalPayment = rocks * PEBBLES_PER_ROCK + stones * PEBBLES_PER_STONE                         + pebbles;


    totalPrice = totalRocks * PEBBLES_PER_ROCK + totalStones * PEBBLES_PER_STONE
               + totalPebbles;


    totalChange = totalPayment - totalPrice;


    changeRocks = (totalPayment - totalPrice) / PEBBLES_PER_ROCK;
    totalChange = totalChange %= PEBBLES_PER_ROCK;


    changeStones = (totalPayment - totalPrice) / PEBBLES_PER_STONE;
    totalChange = totalChange %= PEBBLES_PER_STONE;


    changePebbles = totalChange;
 
    cout << "Change: " << changeRocks << " rocks " << changeStones << " stones "
         << changePebbles << " pebbles " << endl;
    


    return 0;
}

Now *when running the programming* enter the order in c,d:r|s|p
c=coffee
d=donuts
r=rocks
s=stones
p=pebbles

ex. 3,4:7|0|3
should result in 0 rocks 1 stones 0 pebbles in change.

I do get that one right, however I get this one wrong:

1,1:0|0|80
should result in 1 rocks 1 stones 0 pebbles in change.
but I get 1 rocks 6 stones 0 pebbles.

Thanks, I did end up noticing that and made the changes...BUT I'm still having the same problem with change - that just simplified and cleaned my program up.

I am sorry, you're right I put the wrong variable in, my apologies.

It works perfectly, you don't know how glad I am. I even did that change on my own while waiting for a response but you pushing me helped me examine it and try it again. Thanks!