About arrays
 

hey guys,
well i was just wndering if i can delete indexes from an array,for an example if i have a string entered by the user then i took every word in the string into an index of this array but if i have a few indexes in this array that remain null can i delete them ??

Take a look at System.Collections.Generic namespace. There is List<T> which is far far more useful than just a standard Array. There are also other classes in that namepace that act differently but also might be useful.

You cant just remove an item on an array. You have to copy it into a new array up to the point where you want to remove. In your case you would check for nulls to find out where you would stop. You then skip the null index and the continue copying the rest of the array checking for more nulls. I would post some code but you will learn more if you figure it out.

thnx jimmy i will try that.

If you delete an index from an array there remains a gap there in the memory unless you write some sort of funtion to copy all data past the point backward one index to fill the gap. Same behaviour as you would expect in C++, and well many languages I am sure.

List<T> is a great solution to this since it provides funtions which will do exactly that for you!

Oh of course the othe option too is to use something like a linked list which would be faster because your wouldn't be copying data around your memory so much, you just have to update the links between two of the indexes.