Thread: declaring 2d arrays

I am trying to declare a 2d array with a integer as the size the integer is sent from another function.

Is this possible?
because i can't get it to work!

> Is this possible?
It is in C++
And will be when your compiler supports the latest C99 standard

But until then, you need this

Code:

#include <stdlib.h>
void foo ( int size ) {
  int **arr;
  int i;

  // allocate a 2D array
  arr = malloc( sizeof(int*) * size );
  for ( i = 0 ; i < size ; i++ ) arr[i] = malloc( sizeof(int) * size );

  // use arr as  arr[row][col]
  // as if you had declared int arr[size][size];

  // free the allocated array
  for ( i = 0 ; i < size ; i++ ) free( arr[i] );
  free( arr );
}

can only be achieved using dynamic allocation

i.e. using malloc/free for C
or using new/delete for C++