How can I allocate a 2D array using double pointers?

Question

I want to know how can I form a 2D array using double pointers?

Suppose my array declaration is:

char array[100][100];

How can I ge

Answer 1

Typical procedure for dynamically allocating a 2D array using a pointer-to-pointer::

#include 
...
T **arr; // for any type T
arr = malloc(sizeof *arr * ROWS);
if (arr)
{
  size_t i;
  for (i = 0; i < ROWS; i++)
  {
    arr[i] = malloc(sizeof *arr[i] * COLS);
    if (arr[i])
      // initialize arr[i]
    else
      // panic
  }
}

Note that since you're allocating each row separately, the contents of the array may not be contiguous.