Re: C++ question and advice?
- From: Dave <davidct1209@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Sun, 25 Jul 2010 21:18:38 -0700
A while and a do-while loop share the idea of doing some task or
series of tasks repeatedly as long as some condition is true. They
have two parts:
- condition (a boolean check).
- loop body (I'm referring to this as a task).
The only difference between them is the order of doing the task and
checking that the condition is true. A while loop checks the
condition first, then performs the task. A do-while loop performs the
task, then checks the condition.
In a while loop, this has the effect of:
- when first encountering the loop, if the condition isn't true, then
the task never gets performed.
- After executing the task, the condition becomes false at some point
(or else you have an infinite loop).
In a do-while loop, this has the effect of:
- when you first encounter the loop, the task gets performed
regardless if the condition is true.
- otherwise, it's similar to the while loop.
So, in the above terminology, I would say:
- do the next homework assignment while there's more homework to be done. Or,
- while there's more homework to be done, do the next homework assignment.
In effect, you can think of a while loop as a "while, do loop". Each
has their place depending on what you want.
Hth.
On 7/25/10, Sina Bahram <sbahram@xxxxxxxxx> wrote:
> Stick the menu in a while statement.
>
> Take care,
> Sina
>
> -----Original Message-----
> From: programmingblind-bounce@xxxxxxxxxxxxx
> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Jes
> Sent: Sunday, July 25, 2010 6:03 PM
> To: programmingblind@xxxxxxxxxxxxx
> Subject: C++ question and advice?
>
> Hi all,
>
> If I instruct a user to enter a choice from a menu, and they enter an
> invalid response, how do I display the menu of choices again
> without retyping the cout statements? For example, cout << "Please select
> your favorite candy:
> 1. Snickers.
> 2. Baby Ruth.
> 3. Milky way. ";
>
> If the user entered number 4,
> How would I print the menu again without typing all those statements?
> And, can somebody explain to me the difference between the do while, and
> while loops?
> Thanks.
> Jes
>
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