# Write a java program to perform multiplication of two matrices

Week – 2
b)Aim: To Write a java program to perform 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“);
}
}
}
}
Compilation & Execution: D:/cse>javac MatrixMultiplication.java
D:/cse>java MatrixMultiplication
OutPut:
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