This program show how to multiply two matrices A & B into a third matrix C. Here the matrix having 3 rows and 3 columns (3x3). As given below, inputMatrix( ) and displayMatrix( ) are two static methods which are used to read and display the matrix values respectively. java.util.Scanner class is used to read values from keyboard at runtime.
PROGRAM
PROGRAM
import java.util.Scanner; public class MatrixMultiplication { // Method to read matrix elements public static void inputMatrix(int temp[][]) { Scanner s = new Scanner(System.in); for(int i=0;i<3; i++) { for(int j=0; j<3; j++) { temp[i][j] = s.nextInt(); } } } // Method to display matrix elements public static void displayMatrix(int temp[][]) { for(int i=0;i<3; i++) { for(int j=0; j<3; j++) { System.out.print(temp[i][j] + " "); } System.out.println(""); } } public static void main(String[] args) { int a[][] = new int[3][3]; // First matrix int b[][] = new int[3][3]; // Second matrix int c[][] = new int[3][3]; // Final matrix which is to store multiplication result // Input Matrix A elements System.out.println("Enter the 9 numbers for first matrix (3x3)..."); inputMatrix(a); // Input Matrix B elements System.out.println("Enter the 9 numbers for second matrix (3x3)..."); inputMatrix(b); // Multiplication logic goes here for(int i=0; i<3; i++) { for(int j=0; j<3; j++) { for(int k=0; k<3; k++) { c[i][j] = c[i][j] + (a[i][k] * b[k][j]); } } } System.out.println("Matrix A is ..."); displayMatrix(a); System.out.println("Matrix B is ..."); displayMatrix(b); System.out.println("After multiplication Matrix C is ..."); displayMatrix(c); } }OUTPUT
C:\>javac MatrixMultiplication.java C:\>java MatrixMultiplication Enter the 9 numbers for first matrix (3x3)... 1 2 3 4 5 6 7 8 9 Enter the 9 numbers for second matrix (3x3)... 1 2 3 4 5 6 7 8 9 Matrix A is ... 1 2 3 4 5 6 7 8 9 Matrix B is ... 1 2 3 4 5 6 7 8 9 After multiplication Matrix C is ... 30 36 42 66 81 96 102 126 150
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