Breakfast Menu using loops and functions

[diivinnerampage]

I almost have this figured out. The only problem I am having is if the person orders and then when it is time to pay, the person does not give enough money. I can get it to display the new total but if the person does not give enough money again thats where it wont work. I will make an arrow to where I THINK the problem in the code is.

[code]
#include<iostream>
#include<string>
#include<iomanip>

using namespace std;

double total;
double pay;
double change;
double owe;
double tax;

int selection(int choice, double subTotal)
{
cout << "Welcome to Braden's Breakfast of Champions" << endl;
cout << "Enter from the menu below" << endl;
cout << "1. Eggs" << endl;
cout << "2. Pancakes" << endl;
cout << "3. Bacon" << endl;
cout << "4. Waffles" << endl;
cout << "5. Coffee" << endl;
cout << "6. Buscuits" << endl;
cout << "7. Orange Juice" << endl;
cout << "8. Sausage" << endl;
cout << "9. Steak" << endl;
cout << "10. Milk" << endl;
cout << "Subtotal: $" << subTotal << endl;
cout << "Enter Selection (0 to exit): ";
cin >> choice;
return choice;
}



double menuItem(int choice, int quantity, double subTotal)
{
if(choice==1)
subTotal = subTotal + 1.00 * quantity;
if(choice==2)
subTotal = subTotal + 1.99 * quantity;
if(choice==3)
subTotal = subTotal + 1.49 * quantity;
if(choice==4)
subTotal = subTotal + 2.99 * quantity;
if(choice==5)
subTotal = subTotal + 1.00 * quantity;
if(choice==6)
subTotal = subTotal + 1.49 * quantity;
if(choice==7)
subTotal = subTotal + 1.99 * quantity;
if(choice==8)
subTotal = subTotal + 2.49 * quantity;
if(choice==9)
subTotal = subTotal + 4.99 * quantity;
if(choice==10)
subTotal = subTotal + 1.49 * quantity;
return subTotal;
}

double receipt(double subTotal)
{

tax = .10;
tax = tax * subTotal;
total = tax + subTotal;

cout << "Recept for Today's Breakfast item purchase" << endl;
cout << "Subtotal: $" << subTotal << endl;
cout << "Tax: $" << tax << endl;
cout << "Total: $" << total << endl;

return total;

}


int main()
{
cout << fixed << showpoint << setprecision(2);
int choice = 99, quantity;
double subTotal = 0, change = 0, total = 0;

while(choice!=0)
{
system("cls");

choice = selection(choice, subTotal);

if(choice!=0)
{
cout << "Enter Number of items you want to purchase: ";
cin>> quantity;

subTotal = menuItem(choice,quantity,subTotal);

}



}


system("cls");
total=receipt(subTotal);




cout << "Amount paid: $";
cin >> pay;

while(pay<total) //<------------------ PROBLEM AREA----------
{
owe = total - pay;
cout << "You owe: $" << owe << endl;
cout << "Amount paid: $" << endl;
cin >> pay;

if(owe<total)
{
cout << "You owe: $" << owe << endl;
cout << "Amount paid: $" << endl;
cin >> pay;

}







} //<---------- PROBLEM AREA --------------



// make the receipt
receipt(subTotal);

change = pay - total;
cout << "Change: $" << change << endl;



system("pause");
return 0;
}

/*
for a restaurant menu system for breakfast items

Items:
1. eggs
2. pancakes
3. bacon
4. waffles
5. coffee
6. buscuits
7. orange juice
8. sausage
9. steak
10. milk

We want our program to prompt a cashier to enter the customer's selection(s). It should loop while the customer is adding more items. As it is looping, it is useful to displa

y the customer's
current subtotal on the screen.When completed, the program should generate a receipt for the customer which will have a tax of 10% and a total amount due.
*/

I marked the "problem area". I just need the code to keep looping until the customer pays enough money to complete the purchase. Thanks!!

[dhayden]

Initialize owe outside the loop and subtract the payment from the amount owed each time:

total=receipt(subTotal);
owe = total;
do {
    cout << "Amount paid: $";
    cin >> pay;
    owe -= pay;

    if(owe > 0) {
        cout << "You owe: $" << owe << endl;
    }
} while (owe > 0);

// ...
change = -owe;

[diivinnerampage]

Gahhhhh That makes so much more since. I tried something like this extremely close to this solution. Thanks sooooooo much!!!