Table of Contents

**Java Program to multiply two Matrices**

In this program, we will learn to write a java program to perform multiplication of two matrices.

### Source Code: Multiplication of two matrices

import java.util.Scanner;

class MatrixMultiplication

{

publicstaticvoid main(String args[])

{

int m, n, p, q, sum = 0, c, d, k;

Scanner in = new Scanner(System. in);

System.out.println("Enter the number of rows and columns of first matrix");

m = in.nextInt();

n = in.nextInt();

int first[][] = newint[m][n];

System.out.println("Enter elements of first matrix");

for (c = 0; c < m; c++)

for (d = 0; d < n; d++)

first[c][d] = in.nextInt();

System.out.println("Enter the number of rows and columns of second matrix");

p = in.nextInt();

q = in.nextInt();

if (n != p)

System.out.println("The matrices can't be multiplied with each other.");

else

{

int second[][] = newint[p][q];

int multiply[][] = newint[m][q];

System.out.println("Enter elements of second matrix");

for (c = 0; c < p; c++)

for (d = 0; d < q; d++)

second[c][d] = in.nextInt();

for (c = 0; c < m; c++)

{

for (d = 0; d < q; d++)

{

for (k = 0; k < p; k++)

{

sum = sum + first[c][k] * second[k][d];

}

multiply[c][d] = sum;

sum = 0;

}

}

System.out.println("Product of the matrices:");

for (c = 0; c < m; c++)

{

for (d = 0; d < q; d++)

System.out.print(multiply[c][d]+"t");

System.out.print("n");

}

}

}

}

#### Output:

Compilation & Execution: D:/cse>javac MatrixMultiplication.java

D:/cse>java MatrixMultiplication

**Enter the number of rows and columns of first matrix**

**3 3**

**Enter elements of first matrix**

**1 2 3 4 5 6 7 8 9**

**Enter the number of rows and columns of second matrix**

**3 3**

**Enter elements of second matrix**

**9 8 7 6 5 4 3 2 1**

**Product of the matrices:**

**30 24 18**

**84 69 54**

**138 114 90**

**FAQ:**

### How do you multiply matrices in Java?

To multiply matrices in java, first, take two matrices using a loop and multiply them. one-row element of the first matrix is multiplied by all columns of the second matrix.

### Can you multiply two matrices?

Yes definitely, we can multiply to the matrix for that we can see the above example.

### How do you multiply a 2 by 2 matrix?

To multiply the 2 by 2 matrix, we have to follow:

First we have to take user input then we have to follow this procedure:

for (c = 0; c < p; c++)

for (d = 0; d < q; d++)

second[c][d] = in.nextInt();

for (c = 0; c < m; c++)

{

for (d = 0; d < q; d++)

{

for (k = 0; k < p; k++)

{

sum = sum + first[c][k] * second[k][d];

}

multiply[c][d] = sum;

sum = 0;

}

}

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