#### Circular matrix: Write a Program in Java to fill a square matrix of size ‘n*n” in a circular fashion (clockwise) with natural numbers from 1 to n*n, taking ‘n’ as input.

For example: if n = 4, then n*n = 16, hence the array will be filled as given below.

Input : m = 4, n = 4

Output : 1 2 3 4

12 13 14 5

11 16 15 6

10 9 8 7

##### To learn more about how to take input using Buffered Reader in java watch the given video.

https://youtu.be/bTOMwnwpXqs

```
import java.io.*;
class Circular
{
public static void main()throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the length of the double dimensions-rows&columns-- ONLY ONE DIGIT IS TO BE ENTERED FOR BOTH");
int r=Integer.parseInt(br.readLine());
int c=r;
int Arr[][]=new int[r][c];
int k=1;
int c1=0;
int c2=c-1;
int r1=0;
int r2=r-1;
System.out.println("--------CIRCULAR MATRIX------------");
while(k<=(r*c))
{
for(int i=c1;i<=c2;i++)
{
Arr[r1][i]=k++;
}
for(int j=r1+1;j<=r2;j++)
{
Arr[j][c2]=k++;
}
for(int i=c2-1;i>=c1;i--)
{
Arr[r2][i]=k++;
}
for(int i=r2-1;i>=r1+1;i--)
{
Arr[i][c1]=k++;
}
c1 ++;
c2 --;
r1 ++;
r2 --;
}
for(int i=0;i<r;i++)
{
for(int j=0;j<c;j++)
{
System.out.print(Arr[i][j]+"\t");
}
System.out.println();
}
}
```

**Input: **Enter the length of the double dimensions-rows&columns– ONLY ONE DIGIT IS TO BE ENTERED FOR BOTH

4**Output: **

——–CIRCULAR MATRIX————

1 2 3 4

12 13 14 5

11 16 15 6

10 9 8 7

To learn more matrix programs click

https://java4school.com/anticlockwise-circular-matrix