import java.util.*;
class anticlockwise
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.print("Enter the number of elements : ");
int n = sc.nextInt();

int A[][] = new int[n][n];
int k=n*n, c1=0, c2=n-1, r1=0, r2=n-1;

while(k>=1)
{
for(int i=c1;i<=c2;i++)
{
A[r1][i]=k--;
}

for(int j=r1+1;j<=r2;j++)
{
A[j][c2]=k--;
}

for(int i=c2-1;i>=c1;i--)
{
A[r2][i]=k--;
}

for(int j=r2-1;j>=r1+1;j--)
{
A[j][c1]=k--;
}
c1++;
c2--;
r1++;
r2--;
}

/* Printing the Circular matrix */
System.out.println("The Circular Matrix is:");
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
System.out.print(A[i][j]+ "\t");
}
System.out.println();
}
}
}

Output:

Enter the number of elements : 4
The Circular Matrix is:
16 15 14 13
5 4 3 12
6 1 2 11
7 8 9 10