Dynamic Memory Allocation

[fr0ggs]

I'm attempting to do some basic dynamic memory allocation and I've run into a problem I cannot seem to get around. First, if I try the following bit of code:

int x,y;
cin >> x;
cin >> y;
int arr [x][y];

I get the following compiler error:

"Constant expression required in function foo()"

In trying to skirt the above issue, I tried to code it this way:

int x,y;
cin >> x;
cin >> y;
int ** x1;
x1 = new int [x][y];

I get the same error as above plus:

"Cannot convert int(*)[1] to int **."

Am I coding this incorrectly?

[zen]

You can do something like this -

int x,y;
cin >> x;
cin >> y;
int ** x1;
x1 = new int*[x];
for(int i=0;i<y;i++)
x1[i]=new int;

You'll have to use a similar procedure when freeing the memory(only in reverse).

[zen]

Sorry, ignore the above . It should be -

int x,y;
cin >> x;
cin >> y;
int ** x1;
x1 = new int*[x];
for(int i=0;i<x;i++)
x1[i]=new int[y];