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Solved 2024 Thory Paper ISC Computer Science

Class 12 - ISC Computer Science Solved Theory Papers

Rotate Matrix by 270 Degree Anticlockwise Program - ISC 2024 Theory

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

8

7

9

3

-2

0

4

5

1

3

6

-4

ROTATED MATRIX (270° ANTICLOCKWISE)

1

-2

8

3

0

7

6

4

9

-4

5

3

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

Java 
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();
        }
    }
}

Output

 
    
OUTPUT 1:
M = 3
N = 4
ENTER ELEMENTS:
8
7
9
3
-2
0
4
5
1
3
6
-4
ORIGINAL MATRIX :
8   7   9   3   
-2  0   4   5   
1   3   6   -4  
ROTATED MATRIX BY 270 DEGREES ANTICLOCKWISE
1   -2  8   
3   0   7   
6   4   9   
-4  5   3   
SUM OF THE ODD ELEMENTS = 28

OUTPUT 2:

M = 3
N = 2
Invalid Input


OUTPUT 3:

M = 2
N = 10
Invalid Input


OUTPUT 4:

m = 174
n = 4500
INVALID INPUT
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