#include <stdlib.h>   // to use malloc, free 
#include <stdio.h>

typedef int* row_t;       // define row type
typedef row_t* table_t;   // define table type

int main () {

  int num_rows = 2;
  int num_columns = 3;
  table_t t;

  int i,j;

  // allocate space for holding num_rows row references
  // t will refer to this spaces
  t = (table_t) malloc(sizeof(row_t) * num_rows);


  for (i=0; i<num_rows; i++)
    // for every row allocate space for num_columns integers
    t[i]=(int *) malloc(sizeof(int) * num_columns);

  // Fill table t with zeros
  for (i=0; i<num_rows; i++)
    for (j=0; j<num_columns; j++)
      t[i][j] = 0;

  // Print the value in table t, row by row
  for (i=0; i<num_rows; i++){
    for (j=0; j<num_columns; j++)
      printf("%d ", t[i][j]);
    printf("\n");
  }

  // free the dynammically allocated space before terminating
  for (i=0; i<num_rows; i++){
    free(t[i]);
  }
  free(t);

  return 0;
}