How do I write this for loop as a while or do while loop?

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2.33/5 (2 votes)

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C++

for(k = 0; k < 2500; k++)
x[k] = 2500-k;

Posted 15-Dec-15 12:21pm

Member 12209826

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[no name] 15-Dec-15 18:39pm

Think about this, in the hope x[] is compatible:

const int numLoop= 2500;
int k= 0;
while (k < numLoop)
{
x[k]= numLoop - k;
k++;
}

Sergey Alexandrovich Kryukov 15-Dec-15 18:51pm

5! I happened to answer a bit later, probably you posted your comment when I was typing.
I think must important illustration here is "const int" — please see my answer.
—SA

Sergey Alexandrovich Kryukov 15-Dec-15 18:54pm

Anyway, I added a credit to your comment in my answer.
Cheers,
—SA

[no name] 15-Dec-15 19:00pm

A lot of parallel processes without synch today :-)
Thank you, Bruno

Sergey Alexandrovich Kryukov 15-Dec-15 19:28pm

:-)

Member 12209826 15-Dec-15 19:03pm

Thanks guys this helped a lot.

[no name] 15-Dec-15 19:26pm

But do you really understand all of of this and do not copy it 1:1? Please give some Feedback.

Sergey Alexandrovich Kryukov 15-Dec-15 19:28pm

You are very welcome. Good luck, call again.
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-12-15T12:45:00

It's up to you, entirely. I personally would leave it as a "for" loop. Please see the while variant by Bruno (0x01AA) in his comment to the question — the code is longer, without apparent benefits of performance of anything else. He also illustrated the point I'll make below.

I would change another thing, which I consider simply unacceptable. Take a look: you use immediate constant 2500. You could write an explicit constant declaration. But do you understand what's the worst thing here? You have 2500 written twice, and it's very likely that you need this value elsewhere. Imagine you have to change this value, what will you do? Change it in N places?! God forbid…

There is not any reason to have such constant. It only reduce level of abstraction of your algorithm. Of course, it should be a variable, possibly a parameter of some function. And where it should be taken originally? Well, it could be a part of input data, anything. Even a constant, but that constant should be an explicitly defined constant, probably grouped with other constants, and so on. Why? For maintainability and reuse.

—SA

Kevin Marois · Accepted Answer · 2015-12-15T12:39:00

Solution 1

Simple, open your C++ class book and look up Loops. No one here is going to do your homework for you.

Posted 15-Dec-15 12:39pm

Kevin Marois

Comments

[no name] 15-Dec-15 19:10pm

No, not doing the homework. But give some hints I think is ok. I did not vote!