[eXero]

Understanding the 'Do' Loop

I have seen many members confused on how to use loops. Loops should be the first thing you should learn about any programming language as loops are important in every language. I am writing this tutorial explaining the Do Loop. Look for my other tutorials on the other loops.

Step One

Open a new Visual Basic Project. Select Console Application, and name it whatever you want. I named mine "Basic Do Loop".
Spoiler (Click to View)[img]http://i.min.us/ijAanC.png[/img]

Step Two

You should have a screen now that shows this code:
Spoiler (Click to View)[img]http://i.min.us/ij5MfK.png[/img]

Don't worry about all of that. We are only going to work in Sub Main for the time being.

Step Three

This is the Do Loop code itself:
Spoiler (Click to View)[img]http://i.min.us/ij6pVA.png[/img]

Code

Dim i As Integer

Code

Do While i < 10
    Console.WriteLine(i)
    Console.ReadLine()
    i = i + 1
  Loop

Code

Dim i As Integer

- This declared our variable, i as an integer (number). Note that in the picture this is not under Sub Main, but above it.

Code

Do While i < 10

- This means that the loop will continue looping as long as i is less than 10.

Code

Console.WriteLine(i)

- This writes the value of i in the console window.

Code

Console.ReadLine()

- This can best be explained as a pause in the WriteLine. Without the ReadLine the console window would spam the numbers, and then exit before you could even read anything in the console window.

Code

i = i + 1

- This is saying that i is equal to i + 1. This increments i positively by a value of one.

Code

Loop

- This loops back to the Do While statement above. It will go through the entire thing again, but i is now equal to two and so on. Every time the loop completes one rotation, i will have incremented by a value of one.

Step Four

Voila! You have successfully written, and hopefully understood your Basic Do Loop program.

Step Five

Post a reply with what you thought of this tutorial, how well you understood, etcetra. It only takes ten seconds, and I really would love your feedback.

[Deceptive]

Are you going to make an all in one thread? (Putting all your tutorials together)

[eXero]

I don't know. Should I? Why would I? I can just link the other tutorials in each tutorial.

[Talk3r]

Nice Share Mate , I already Knows about it But Thanks for Nice TUT

[eXero]

Hopefully this will help some noobs out.

[The MammoTh]

Was the screnshot of creating a destop application really needed?

[eXero]

Was the screnshot of creating a destop application really needed?

No but why does it matte... oh wait it doesn't.

[.Dangerous.]

why isn't "until" explained in with the do loops as well.

also

I =+ 1, i think I = I + 1 should have died with vb6,

however great tutorial, hope it stops some people from asking questions.

Edit:
it'd be nice to see show helpful references
http://msdn.microsoft.com/en-us/library/eked04a7

[Modesty]

Lol dude you explain the do loop, except not the do until, do while, loop until, loop while, or just a general while loop? Just make a tut called Loops and explain all the iteration and selection loops in vb.net, would help members much more. Don't put out useless tuts wasting bandwidth, just my feedback 😉

[Dark_Noodles]

Lol dude you explain the do loop, except not the do until, do while, loop until, loop while, or just a general while loop? Just make a tut called Loops and explain all the iteration and selection loops in vb.net, would help members much more. Don't put out useless tuts wasting bandwidth, just my feedback 😉

^ Agreed.

This user had 2 threads about his theme. He puts them on a survey link and expect us to download. Ubers like him are retarded.

[eXero]

I just read through my old tutorial and it still seems relevant for all you new VB.Net coders. I realize it isn't the best tutorial in the sense of teaching, but as for referencing and learning, it can be of some benefit.

[$lick]

I just read through my old tutorial and it still seems relevant for all you new VB.Net coders. I realize it isn't the best tutorial in the sense of teaching, but as for referencing and learning, it can be of some benefit.

I usually attack grave diggers, But this is still relevant and HQ.

[eXero]

I usually attack grave diggers, But this is still relevant and HQ.

I wouldn't have grave dug it if it weren't relevant. Some people NEED to read this.

[Meerkat.]

I wouldn't have grave dug it if it weren't relevant. Some people NEED to read this.

You think so? If it were a good tutorial, maybe. But this is useless, as is gravedigging this thing.

[ubbelol]

Bit over the top explaining for such a simple concept IMO. Can just as easily be described as:



Execute code (orange) while expression (yellow) is true. Alternatively if you're looking for more in-depth info you could just read: http://msdn.microsoft.com/en-us/library/eked04a7.aspx