Read one positive integer n. Then create an n X n two-dimensional array and write the code that stores integers from 1 to n2 as follows. Print the array using System. out. printf statement. Enter the size of the array : 1 Enter the size of the array : 2
1 1 2
4 3
Enter the size of the array : 10
Enter the size of the array : 7 1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
21 22 23 24 25 26 27 28 29 30
1 2 3 4 5 6 7 40 39 38 37 36 35 34 33 32 31
14 13 12 11 10 9 8 41 42 43 44 45 46 47 48 49 50
15 16 17 18 19 20 21 60 59 58 57 56 55 54 53 52 51
28 27 26 25 24 23 22 61 62 63 64 65 66 67 68 69 70
29 30 31 32 33 34 35 80 79 78 77 76 75 74 73 72 71
42 41 40 39 38 37 36 81 82 83 84 85 86 87 88 89 90
43 44 45 46 47 48 49 100 99 98 97 96 95 94 93 92 91

The program in Java is as follows:

import java.util.*;

public class Main{

public static void main(String[] args) {

    int n;

    Scanner input = new Scanner(System.in);

 System.out.print("Size of array: ");

 n = input.nextInt();

 int count = 1;

 int[][] arr = new int[n][n];

 for(int i = 0; i<n;i++){

     for(int j = 0; j<n;j++){

         arr[i][j] = count;

         count++;      }  }

 for(int i = 0; i<n;i++){

     for(int j = 0; j<n; j++){

         System.out.printf(arr[i][j]+" ");      }

     System.out.println();  }}}

Explanation:

This declares the size of the array

    int n;

    Scanner input = new Scanner(System.in);

This prompts the user for size of array

 System.out.print("Size of array: ");

This gets input for size of array

 n = input.nextInt();

This initializes the array element to 1

 int count = 1;

This creates a 2d array

 int[][] arr = new int[n][n];

This iterates through the rows

 for(int i = 0; i<n;i++){

This iterates through the columns

     for(int j = 0; j<n;j++){

This populates the array

         arr[i][j] = count;

         count++;      }  }

The following nested loop prints the array elements

 for(int i = 0; i<n;i++){

     for(int j = 0; j<n; j++){

         System.out.printf(arr[i][j]+" ");      }

     System.out.println();  }}}

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