Question

Write a program to accept a two-dimensional integer array of order 4 x 5 as input from the user. Check if it is a Sparse Matrix or not. A matrix is considered to be a sparse, if the total number of zero elements is greater than the total number of non-zero elements. Print appropriate messages.

Example:

Answer 1

import java.util.Scanner;

public class SparseMatrix {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        // Declare a 2D array of order 4x5
        int[][] matrix = new int[4][5];
        int zeroCount = 0;
        int nonZeroCount = 0;

        // Input: Accepting elements for the matrix
        System.out.println("Enter 20 elements for a 4x5 matrix:");
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 5; j++) {
                matrix[i][j] = sc.nextInt();
                
                // Logic: Counting zero and non-zero elements
                if (matrix[i][j] == 0) {
                    zeroCount++;
                } else {
                    nonZeroCount++;
                }
            }
        }

        // Output: Printing the counts
        System.out.println("Number of zero elements = " + zeroCount);
        System.out.println("Number of non zero elements = " + nonZeroCount);

        // Condition check for Sparse Matrix
        if (zeroCount > nonZeroCount) {
            System.out.println("Matrix is a Sparse Matrix");
        } else {
            System.out.println("Matrix is NOT a Sparse Matrix");
        }
    }
}