Rotate Matrix 270° Anticlockwise Java Program | ISC Computer Science 2024 Paper 2

Write a program to declare a matrix A[][] of order (M × N) where ‘M’ is the number of rows and ‘N’ is the number of columns such that both M and N must be greater than 2 and less than 10. Allow the user to input integers into this matrix. Display appropriate error message for an invalid input.

Perform the following tasks on the matrix:
(a) Display the input matrix.
(b) Rotate the matrix by 270° anticlockwise and display the resultant matrix.
(c) Calculate the sum of the odd elements of the matrix and display.

Test your program for the following data and some random data:

Example 1
INPUT:
M = 3
N = 4
ENTER ELEMENTS: 8, 7, 9, 3, -2, 0, 4, 5, 1, 3, 6, -4
OUTPUT:
ORIGINAL MATRIX

8793
-2045
136-4

ROTATED MATRIX (270° ANTICLOCKWISE)

1-28
307
649
-453

SUM OF THE ODD ELEMENTS = 28

Example 2
INPUT:
M = 3
N = 2
OUTPUT: INVALID INPUT

Example 3
INPUT:
M = 2
N = 10
OUTPUT: INVALID INPUT

import java.util.Scanner;
class Rotate{
    public static void main(String args[]){
        Scanner in=new Scanner(System.in);
        System.out.print("M = ");
        int m=Integer.parseInt(in.nextLine());
        System.out.print("N = ");
        int n=Integer.parseInt(in.nextLine());
        if(m<3 || n<3 || m>9 || n>9){
            System.out.println("Invalid Input");
            return;
        }
        int a[][]=new int[m][n];
        int b[][]= new int[n][m];
        int sum=0;
        System.out.println("ENTER ELEMENTS:");
        for(int i=0;i<m;i++){
            for(int j=0;j<n;j++){
                a[i][j]=Integer.parseInt(in.nextLine());
                if(a[i][j]%2!=0)
                    sum+=a[i][j];
            }
        }
        System.out.println("ORIGINAL MATRIX :");
        display(a,m,n);
        int q=0;
        for(int i=m-1;i>=0;i--){
            int p=0;
            for(int j=0;j<n;j++){
                b[p][q]=a[i][j];
                p++;
            }
            q++;
        }
        System.out.println("ROTATED MATRIX BY 270 DEGREES ANTICLOCKWISE");
        display(b,n,m);
        System.out.println("SUM OF THE ODD ELEMENTS = " + sum);
    }
    public static void display(int a[][], int m, int n){
        for(int i=0;i<m;i++){
            for(int j=0;j<n;j++){
                System.out.print(a[i][j]+ "\t");
            }
            System.out.println();
        }
    }
}

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