[prog] switch statement

[Wolf Rising]

Hi,

Thank you for responding :-)

When I run the code with the changes below I get this print out:

Enter the product number (enter 0 to end): 1
Enter the quantity of this product you wish to order: 2
Enter the product number (enter 0 to end): 0
INCORRECT NUMBER ENTERED. PLEASE TRY AGAIN. 
The total sales in dollars is: 5.96

How would I adjust it without the if statement to prevent the 
INCORRECT NUMBER ENTERED
PLEASE TRY AGAIN from appearing?


On Thu, 16 Dec 2004 15:35:00 +1100, Jacinta Richardson
<jarich at perltraining.com.au> wrote:
> The if statement isn't required, and personally I'd leave it out.  This
> can be done with the following changes:
> 
> > #include <iostream>
> > using namespace std;
> >
> > int main() {
> >
> >       //define variables
> >       int  product; // product to be ordered
> >       int  quantity;//quantity to be ordered
> >       double price;
> >       double totalSales;
> >
> >
> >       // Get input from user
> >
> >       do {
> >               product = 0;
> >               //order product desired by product number
> >               cout << "Enter the product number (enter 0 to end): ";
> >               //receive product number
> >               cin >> product;
> >
> >
> >               //begin switch statement, define prices of product by number
> >               switch ( product) {
> >                       case 0:
> >                               break;
> >
> >                       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 << "INCORRECT NUMBER ENTERED. PLEASE TRY AGAIN. \n";
>                                 continue;  /* Restart the loop */
> >
> >               }
> >
> 
>                 // If we reach here, we must have valid input.
> >               //order quantity of product desired
> >               cout << "Enter the quantity of this product you wish to order: ";
> >               //receive quantity
> >               cin >> quantity;
> >
> >               //calculate total
> >               totalSales += quantity * price;
> >
> >       }while (product != 0);
> >
> >       cout << "The total sales in dollars is: " << totalSales;
> >
> >       return 0;
> > }
> 
> My rationalisation for this is that if you go and add another case in,
> you don't have to update the if statement.  It also assists in avoiding
> the case where you have cases 1-5 and 7, 9, but 6 and 8 are invalid (for
> some spurious reason).
> 
> This should always work unless I've forgotten something about calling
> continue for a loop from a switch statement....
> 
> All the best,
> 
>     Jacinta
> 
> --
>     ("`-''-/").___..--''"`-._          |  Jacinta Richardson         |
>      `6_ 6  )   `-.  (     ).`-.__.`)  |  Perl Training Australia    |
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> 
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