Java program to multiply two matrices

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mahmoud2506

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2022-05-07

301

Given two matrices and find their multiplication in third matrix and print the matrix using Java program.

Example:

Input (Matrix 1)
25 52
65 85

Input (Matrix 2)
96 65
36 85

Output (Multiplication Matrix)
4272 6045 
9300 11450

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mahmoud2506

2022-05-07

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Program to find matrix multiplication using java program

import java.util.Scanner;

public class MatrixMultiplication {
  public static void main(String args[]) {
    int n;
    //object of scanner class
    Scanner input = new Scanner(System.in);

    //input base (number of rows and cols)
    System.out.print("Enter the base the matrices : ");
    n = input.nextInt();

    //create two_D array (matrix) objects
    int[][] a = new int[n][n];
    int[][] b = new int[n][n];
    int[][] c = new int[n][n];

    //input matrix 1
    System.out.println("Enter the elements of 1st Matrix row wise \n");
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
        a[i][j] = input.nextInt();
      }
    }

    //input matrix 2
    System.out.println("Enter the elements of 2nd mrtix row wise \n");
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
        b[i][j] = input.nextInt();
      }
    }

    //multiplication logic
    System.out.println("Multiplying both sthe matrices...");
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
        for (int k = 0; k < n; k++) {
          c[i][j] = c[i][j] + a[i][k] * b[k][j];
        }
      }
    }

    //print final/result matrix 
    System.out.println("The product of the matrices is : ");
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
        System.out.print(c[i][j] + " ");
      }
      System.out.println();
    }
    input.close();
  }
}

Output 1

Enter the base the matrices : 5

Enter the elements of 1st Matrix row wise 

12 45 56 85 25
12 41 20 25 65
36 54 52 58 68 
32 12 20 12 32
45 87 45 65 35 
Enter the elements of 2nd Matrix row wise 

45 65 25 35 14
12 12 12 12 12
32 31 36 35 34
52 51 58 57 59 
63 65 69 68 64

Multiplying both the matrices...
The product of the matrices is : 
8867  9016  9511  9465  9227 
7067  7392  7447  7457  6975 
11232 11978 11476 11658 10694 
4864  5536  4568  4824  4028 
10094 10954 9974  10279 9279

Output 2

Enter the base the matrices : 2

Enter the elements of 1st Matrix row wise 

25 52
65 85
Enter the elements of 2nd Matrix row wise 

96 65
36 85
Multiplying both the matrices...
The product of the matrices is : 
4272 6045 
9300 11450

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