Question 4.3:Write a program in Java for multiplication of two square Matrices.
Test Data :
Input the rows and columns of first matrix : 2 2
Input the rows and columns of second matrix : 2 2
Input elements in the first matrix :
element - [0],[0] : 1
element - [0],[1] : 2
element - [1],[0] : 3
element - [1],[1] : 4
Input elements in the second matrix :
element - [0],[0] : 5
element - [0],[1] : 6
element - [1],[0] : 7
element - [1],[1] : 8
Expected Output:
The First matrix is :
1 2
3 4
The Second matrix is :
5 6
7 8
The multiplication of two matrix is :
19 22
43 50
Solution:
package lab4problem3;
import java.util.Scanner;
public class Lab4Problem3 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Input the rows and columns of first matrix : ");
int row1 = input.nextInt();
int column1 = input.nextInt();
System.out.print("Input the rows and columns of second matrix : ");
int row2 = input.nextInt();
int column2 = input.nextInt();
int i , j, k , l, m, n, o;
System.out.println("Input elements in the first matrix : ");
int array1[][] = new int[row1][column1];
for (i = 0; i < row1; i++) {
for (j = 0; j < column1; j++) {
System.out.print("element - [" + i + "],[" + j + "] : ");
array1[i][j] = input.nextInt();
}
}
System.out.println("Input elements in the second matrix : ");
int array2[][] = new int[row2][column2];
for (k = 0; k < row2; k++) {
for (l = 0; l < column2; l++) {
System.out.print("element - [" + k + "],[" + l + "] : ");
array2[k][l] = input.nextInt();
}
}
System.out.println("The First matrix is : ");
for (i = 0; i < row1; i++) {
for (j = 0; j < column1; j++) {
System.out.print(array1[i][j] +" ");
}
System.out.println();
}
System.out.println("The Second matrix is : ");
for (k = 0; k < row2; k++) {
for (l = 0; l < column2; l++) {
System.out.print(array2[k][l] +" ");
}
System.out.println();
}
System.out.println("The multiplication of two matrix is : ");
int array3[][] = new int[row1][column2];
for(m = 0; m < row1; m++) {
for (n = 0; n < column2; n++) {
array3[m][n] = 0;
for (o = 0; o < column1; o++) {
array3[m][n] = array3[m][n] + (array1[m][o] * array2[o][n]);
}
System.out.print(array3[m][n] + " ");
}
System.out.println("");
}
}
}
