Passing a 2D array in a function in C program

Question

Below program (a toy program to pass around arrays to a function) doesn\'t compile. Please explain me, why is the compiler unable to compile(either because of techni

Answer 1

In your code the double pointer is not suitable to access a 2D array because it does not know its hop size i.e. number of columns. A 2D array is a contiguous allotted memory.

The following typecast and 2D array pointer would solve the problem.

# define COLUMN_SIZE 4
void print2(int ** array,int n,int m)
{
    // Create a pointer to a 2D array
    int (*ptr)[COLUMN_SIZE];
    ptr = int(*)[COLUMN_SIZE]array;

    int i,j;
    for(i = 0; i < n; i++)
    {
       for(j = 0; j < m; j++)
       printf("%d ", ptr[i][j]);
       printf("\n");
    }
}