✏️ Explanatory Question

Write a Java program to multiply two matrices. Ensure that the number of columns in the first matrix is equal to the number of rows in the second matrix.

Given matrices:

Matrix A (2x3):


1  2  3  
4  5  6

Matrix B (3x2):


7  8  
9 10  
11 12

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← Previous Write a Java program that prints the diagonal elements of a square 2D array. Given the following array: int[][] matrix = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
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Answer with Explanation


public class Main {
    public static void main(String[] args) {
        int[][] matrixA = {
            {1, 2, 3},
            {4, 5, 6}
        };
        int[][] matrixB = {
            {7, 8},
            {9, 10},
            {11, 12}
        };
        
        int[][] result = new int[2][2];
        
        for (int i = 0; i < matrixA.length; i++) {
            for (int j = 0; j < matrixB[0].length; j++) {
                for (int k = 0; k < matrixA[0].length; k++) {
                    result[i][j] += matrixA[i][k] * matrixB[k][j];
                }
            }
        }
        
        // Print result
        for (int i = 0; i < result.length; i++) {
            for (int j = 0; j < result[i].length; j++) {
                System.out.print(result[i][j] + " ");
            }
            System.out.println();
        }
    }
}
← Previous Write a Java program that prints the diagonal elements of a square 2D array. Given the following array: int[][] matrix = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };