#include <stdio.h>
  void main()
  {
    int arr[4][4];
  }

#include <stdio.h>
  void main()
  {
    int rows, cols;
    int **arr; //double pointer declaration

    printf("enter amount of rows: ");
    scanf("%d",&rows);

    printf("enter amount of cols: ");
    scanf("%d",&cols);

    // first allocation - array of pointers
    arr = (int**)malloc(sizeof(int*) * rows);

    for(int i=0; i<rows; i++)
    {
      // each one of the pointers points towards an array.
      arr[i] = (int*)malloc(sizeof(int) * cols);
    }
  }

int returnSum(int **arr, int rows, int cols)
{
  int i=0 ,j=0 ,sum=0;

  for(i=0; i < rows; i++)
  {
    for(j=0; j < cols; j++)
    {
      sum += arr[i][j]; 
    }
  }
  return sum;
}

 void printMat(int **arr ,int rows ,int cols)
{
  int i = 0 ,j = 0;

  for(i=0; i < rows; i++)
  {
    for(j=0; j < cols; j++)
    {
      printf("%d " , arr[i][j]);     
    }
    printf("\n");
  }
}