GIVEN A SQUARE MATRIX [][] OF ORDER “N”IS 10 . Accept three different characters from the keyword and fill the array according to the instruction given below.

GIVEN A SQUARE MATRIX [][] OF ORDER “N”IS 10 . Accept three different characters from the keyword and fill the array according to the instruction given below.
Fill the upper and lower elements formed by the intersection of the diagonals by character 1 . 
Fill the left and right elements formed by the intersection of the diagonals by character 2.
 Fill both the diagonals by character 3. 
EXAMPLE 1
 ENTER SIZE : 4 
INPUT :    FIRST CHARACTER : ‘*’ 
                   SECOND CHARACTER : ‘?’
                   THIRD CHARACTER :’#’ 
OUTPUT:
 #**# 
?##? 
?##?
 #**#

Answer:

import java.util.*;
class MatrixFill
{
 public static void main(String args[])
 {
 Scanner sc = new Scanner(System.in);
 System.out.print("Enter size of the matrix : ");
 int n = sc.nextInt();
 if(n<2 || n>10)
 System.out.println("Size out of Range");
 else
 {
 char A[][]=new char[n][n];
 System.out.print("Enter the 1st character : ");
 char c1 = sc.next().charAt(0);
 System.out.print("Enter the 2nd character : ");
 char c2 = sc.next().charAt(0);
 System.out.print("Enter the 3rd character : ");
 char c3 = sc.next().charAt(0);
 for(int i=0; i<n; i++)
 {
 for(int j=0; j<n; j++)
 {
 if(i==j || (i+j)==(n-1))
 A[i][j] = c3; // Filling the diagonals with 3rd character
 else
 A[i][j] = c2; // Filling all other positions with 2nd character
 }
 }
 for(int i=0; i<n/2; i++)
 {
 for(int j=i+1; j<n-1-i; j++)
 {
 A[i][j] = c1;           // Filling the upper positions formed by intersection of diagonals
 A[n-1-i][j] = c1;       // Filling the lower positions formed by intersection of diagonals
 }
 }
 // Printing the Matrix
 System.out.println("\nOutput : \n");
 for(int i=0; i<n; i++)
 {
 for(int j=0; j<n; j++)
 {
 System.out.print(A[i][j]+" ");
 }
 System.out.println();
 }
 }
 }
}

Output: