Question

I have a table that looks like this.

1234

5678

9101112

I need to use this code

public class Lab8
{
    public static void main(String argv[])
    {
        int ar[][] = new int[3][4];

        int n = 1;

        for (int i=0; i < ar.length; i++) {
            for (int j=0; j< ar[i].length; j++) {
                ar[i][j] = n;
                n++;
            }
        }

        // print out the elements of the array
        // left to right, top to bottom
        for (int i=0; i < ar.length; i++) {
            for (int j=0; j < ar[i].length; j++) {
                System.out.print(ar[i][j] + " ");
            }
        }
        System.out.println();

        // your code goes here!
    }
}

By using a two dimensional arrays to store the table. Then use two indexes to store the values so that I can print them out like so.   

== OUTPUT =================================================
1 2 3 4 5 6 7 8 9 10 11 12 
4 3 2 1 8 7 6 5 12 11 10 9 
9 10 11 12 5 6 7 8 1 2 3 4 
12 11 10 9 8 7 6 5 4 3 2 1 
1 5 9 2 6 10 3 7 11 4 8 12 
9 5 1 10 6 2 11 7 3 12 8 4 
4 8 12 3 7 11 2 6 10 1 5 9 
12 8 4 11 7 3 10 6 2 9 5 1 

Answer 1

Program

public class Lab8 {
    public static void main(String[] args) {
        int ar[][] = new int[3][4];

        int n = 1;

        for (int i=0; i < ar.length; i++) {
            for (int j=0; j< ar[i].length; j++) {
                ar[i][j] = n;
                n++;
            }
        }

        // print out the elements of the array
        // left to right, top to bottom
        System.out.println("\n== OUTPUT =================================================");
        for (int i=0; i < ar.length; i++) {
            for (int j=0; j < ar[i].length; j++) {
                System.out.print(ar[i][j] + " ");
               
            }
        }
        System.out.println();
        for (int i=0; i < ar.length; i++) {
    for(int j = ar[i].length-1; j >=0; j--) {
        System.out.print(ar[i][j] + " ");
       
    }
}
        System.out.println();
        for (int i=ar.length-1; i >=0; i--) {
    for (int j=0; j < ar[i].length; j++) {
        System.out.print(ar[i][j] + " ");
       
    }
}
        System.out.println();
        for (int i=ar.length-1; i >=0; i--) {
    for(int j = ar[i].length-1; j >=0; j--) {
        System.out.print(ar[i][j] + " ");
       
    }
}
        System.out.println();
       for (int i=0; i <=ar.length; i++) {
            for (int j=0; j < ar.length; j++) {
                System.out.print(ar[j][i] + " ");
               
            }
        }
      
       System.out.println();
       for (int j=0; j < ar.length+1; j++) {
       for (int i=ar.length-1; i >=0; i--) {
   
                System.out.print(ar[i][j] + " ");
               
            }
        }
      
       System.out.println();
       for(int j = ar.length; j >=0; j--) {
       for (int i=0; i <ar.length; i++) {       
                System.out.print(ar[i][j] + " ");
               
            }}
      
       System.out.println();
       for(int j = ar.length; j >=0; j--) {
       for (int i=ar.length-1; i >=0; i--) {
           System.out.print(ar[i][j] + " ");
               
            }}
       
       
        }

    }

   

Output

== OUTPUT =================================================
1 2 3 4 5 6 7 8 9 10 11 12
4 3 2 1 8 7 6 5 12 11 10 9
9 10 11 12 5 6 7 8 1 2 3 4
12 11 10 9 8 7 6 5 4 3 2 1
1 5 9 2 6 10 3 7 11 4 8 12
9 5 1 10 6 2 11 7 3 12 8 4
4 8 12 3 7 11 2 6 10 1 5 9
12 8 4 11 7 3 10 6 2 9 5 1