How would you end this loop?

[nothing]

#include <iostream>
using std::cout;
using std::cin;
using std::endl;

int main()
{
int quantity;
int product_number = 0;
double price;
double total = 0;

while(product_number != -1) {

cout << "Enter product number (-1 to end): ";
cin >> product_number;

cout << "\nEnter quantity: ";
cin >> quantity;

switch(product_number) {

case 1:
price = 2.98;
break;

case 2:
price = 4.50;
break;

case 3:
price = 9.98;
break;

case 4:
price = 4.49;
break;

case 5:
price = 6.87;
break;

default:
cout << "Please enter a valid product number.\n" << endl;
}

total += (price * quantity);
}

cout << "The total retail value of all products sold last week is: $" << total << endl;

return 0;
}


That is not working and I can't figure a way to end the loop. Thanks.

[fishybawb]

#include <iostream>
using std::cout;
using std::cin;
using std::endl;

int main()
{
int quantity;
int product_number = 0;
double price;
double total = 0;

while(product_number != -1) {

cout << "Enter product number (-1 to end): ";
cin >> product_number;

if(product_number == -1)
break;

cout << "\nEnter quantity: ";
cin >> quantity;

switch(product_number) {

case 1:
price = 2.98;
break;

case 2:
price = 4.50;
break;

case 3:
price = 9.98;
break;

case 4:
price = 4.49;
break;

case 5:
price = 6.87;
break;

default:
cout << "Please enter a valid product number.\n" << endl;
}

total += (price * quantity);
}

cout << "The total retail value of all products sold last week is: $" << total << endl;

return 0;
}