Print Matrix in Spiral Form (Java)

Hi Friends,

Did you even think to print the matrix in spiral form?? Just try it yourself its interesting to create the algorithm for Spiral form.

Square Matrix		Spiral Matrix
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16	to	1 2 3 4 12 13 14 5 11 16 15 6 10 9 8 7

Let me explain you an algo to accomplish this task.. (In Java)

class Spiral
{
 public static void main(String args[]) 
 { 
  int n = 4; // matrix size 
  
  int a[][] = new int[n][n];
  int c = 1;
  for (int i = n-1, j = 0; i > 0; i--, j++) 
  {
   for (int k = j; k < i; k++)
   {
    a[j][k]=c++;
   }
   for (int k = j; k < i; k++)
   {
    a[k][i]=c++;
   }
   for (int k = i; k > j; k--)
   {
    a[i][k]=c++;
   }
   for (int k = i; k > j; k--)
   {
    a[k][j]=c++;
   }
  } 
  
  //special case for middle element if value of 'n' is odd
  if (n % 2 == 1)
  {
   a[(n-1)/2][(n-1)/2] = c++;
  }
  
  for(int i = 0; i < n; i++)
  {
   for(int j = 0; j < n; j++)
   {
    System.out.print(a[i][j]+"\t");
   }
   System.out.println();
  } 
 }
}

Just copy paste the above code and save as 'Spiral.java' and compile and run it..

Happy Coding..  :)