(Calculating Total Sales) A mail order house sells five different products whose retail prices are: product 1 — $2.98, product 2—$4.50, product 3—$9.98, product 4—$4.49 and product 5— $6.87. Write a program that reads a series of pairs of numbers as follows: a) product number b) quantity sold Your program should use a switch statement to determine the retail price for each product. Your program should calculate and display the total retail value of all products sold. Use a sentinel-con- trolled loop to determine when the program should stop looping and display the final results.

What will be an ideal response?

```
// Calculate sales, based on an product number and quantity sold
#include
#include // parameterized stream manipulators
using namespace std;
int main()
{
double product1 = 0; // amount sold of first product
double product2 = 0; // amount sold of second product
double product3 = 0; // amount sold of third product
double product4 = 0; // amount sold of fourth product
double product5 = 0; // amount sold of fifth product

int productId = 1; // current product id number
int quantity; // quantity of current product sold

// set floating-point number format
cout << fixed << setprecision( 2 );

// ask user for product number until flag value entered
while ( productId != -1 )
{
// determine the product chosen
cout << "Enter product number (1-5) (-1 to stop): ";
cin >> productId;

// verify product id
if ( productId >= 1 && productId <= 5 )
{
// determine the number sold of the item
cout << "Enter quantity sold: ";
cin >> quantity;

// increment the total for the item by the
// price times the quantity sold
switch ( productId )
{
case 1:
product1 += quantity * 2.98;
break;

case 2:
product2 += quantity * 4.50;
break;

case 3:
product3 += quantity * 9.98;
break;

case 4:
product4 += quantity * 4.49;
break;

case 5:
product5 += quantity * 6.87;
break;
} // end switch
} // end if
```