
arrange the natural n umber in 5x5 matrix as
21 22 23 24 25 20 7 8 9 10 19 6 1 2 11 18 5 4 3 12 17 16 15 14 13
i at centerd position and remaining arrange in anticlockwise direction.

public class NumberSpiral{
public static void main(String[] args) {
int n=5;
int i, s = n,x=0, y=0;
int arr [][]= new int [n][n];
i=n*n;
while(i>=1){
for(int j=0; j<s; j++)
arr[x][y++] = i--;
x++;
y--;
if(i>=1){for(int j=0; j<s-1; j++)
arr[x++][y] = i--;
x--;
y--;
}
if(i>=1){for(int j=0; j<s-1; j++)
arr[x][y--] = i--;
x--;
y++;
}
if(i>=1){for(int j=0; j<s-2; j++)
arr[x--][y] = i--;
y++;
x++;
s=s-2;
}
}
for(i=0; i<n; i++){
for(int j=0; j<n; j++)
System.out.print(arr[i][j] + "\t");
System.out.println();
}
}
}
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