Creating a Dynamic One Dimensional Array

[sde]

Anakashar created a new c++ article here:

http://cpp.codenewbie.com/articles/c...ay-Page_1.html

Thanks Anakashar!

[DJMaze]

Nice but it doesn't always work.
I got my compiler fail a few times if the array is defined outside main.
Instead i had to use vector or alloc()

int array = new int[10];
// but can't resize it now
array = new int[100]; // error

array = (int *)malloc(10 * sizeof(int *));
array = (int *)realloc(array, 100 * sizeof(int *));

[Anakashar]

I think I see what you're doing, you gotta delete [] array the array before you re-declare it as a different new int[]

[DJMaze]

Originally Posted by Anakashar

(and I think I see what you're doing, you gotta delete [] array the array before you re-declare it as a different new int[])

That's actualy my point. Your not realy creating a dynamic array since you either need to delete it or copy data from one array into the other and then delete the old one.
So mainly your example is dynamic but not sufficient when you need to resize it after declaration.

So using alloc functions to resize the array you are realy working dynamical without creating memory overhead and without process abuse

I've that path many times before and it bugged me BUT it is a nice newbie example how to create a dynamic array.

[kyoryu]

Originally Posted by DJMaze

Nice but it doesn't always work.
I got my compiler fail a few times if the array is defined outside main.
Instead i had to use vector or alloc()

int array = new int[10];
// but can't resize it now
array = new int[100]; // error

Use an int*, not an int. In C, arrays are basically pointers with prettier semantics.

int *array = new int[ 10 ];
array = new int[ 100 ];

It'll compile and run, but it is an automatic memory leak.

[AssKoala]

I don't know how anyone missed this one.

Page 2:

int Array[50];

assigns the array Array to hold 51 integer values.

Like hell it does.

[Anakashar]

Yeah, I made one or two errors in some places, mostly it was typed at 3 in the morning.. I changed some things around in there without changing something elsewhere when I made it.

It was my first one, geez..

[AssKoala]

Originally Posted by Anakashar

Yeah, I made one or two errors in some places, mostly it was typed at 3 in the morning.. I changed some things around in there without changing something elsewhere when I made it.

It was my first one, geez..

It may also be the first one some newbie reads.

[Anakashar]

I'll fix it in a bit, then. It's in the intermediate section, but I'll fix it with permission of a mod.

[Valmont]

We learn from eachother. That's the way to go.