Amcat-automata-question4.c

// Program to print the given 2D Array or Matrix in spiral form

#include <stdio.h>
#define R 4
#define C 5
void
spiralOfMatrix (int enrow, int encol, int arr1[R][C])
{
  int i, rowind = 0, colind = 0;
  while (rowind < enrow && colind < encol)
    {
      for (i = colind; i < encol; ++i)
	{
	  printf ("%d ", arr1[rowind][i]);
	}
      rowind++;
      for (i = rowind; i < enrow; ++i)
	{
	  printf ("%d ", arr1[i][encol - 1]);
	}
      encol--;
      if (rowind < enrow)
	{
	  for (i = encol - 1; i >= colind; --i)
	    {
	      printf ("%d ", arr1[enrow - 1][i]);
	    }
	  enrow--;
	}
      if (colind < encol)
	{
	  for (i = enrow - 1; i >= rowind; --i)
	    {
	      printf ("%d ", arr1[i][colind]);
	    }
	  colind++;
	}
    }
}

int
main ()
{
  int i, j;
  int arr1[R][C] = { {1, 2, 3, 4, 5},
  {6, 7, 8, 9, 10},
  {11, 12, 13, 14, 15},
  {16, 17, 18, 19, 20}
  };
  //------------- print original array ------------------        
  printf ("The given array in matrix form is :  \n");
  for (i = 0; i < R; i++)
    {
      for (j = 0; j < C; j++)
	{
	  printf ("%d  ", arr1[i][j]);
	}
      printf ("\n");
    }
//------------------------------------------------------        
  printf ("The spiral form of above matrix is: \n");
  spiralOfMatrix (R, C, arr1);
  return 0;
}