what does ** mean in C

What does it mean when a object has 2 asterisks at the beginning?

**variable

Answers:

It is pointer to pointer. For more details you can check : Pointer to pointer

EDIT It can be good for example for dynamically allocating multidimensional arrays :

Like :

#include <stdlib.h>
int **array;
array = malloc(nrows * sizeof(int *));
if(array == NULL)
{
    fprintf(stderr, "out of memory\n");
    exit or return
}
for(i = 0; i < nrows; i++)
{
    array[i] = malloc(ncolumns * sizeof(int));
    if(array[i] == NULL)
    {
        fprintf(stderr, "out of memory\n");
        exit or return
    }
}

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