JAVA PROGAM TO COMPUTE nxn MATRIX MULTIPLICATION

Program Statement: Write a JAVA program to compute Matrix Multiplication.

Tested on:

Software: Windows 8, Jdk 1.6,   Netbeans IDE

Hardware: Intel Core i3, 4 GB RAM, 500 GB HDD

Source Code

@Author: Praveen Kanwar
import java.util.*;
class Multiplication
{
    int[][] mul(int x[][],int y[][],int z[][],int m,int n,int p,int q)
    {
   
    for(int r=0;r<m;r++)
        {   
    for(int c=0;c<n;c++)
            {
        z[r][c]=0;
        for(int k=0;k<p;k++)
            z[r][c]=z[r][c]+x[r][k]*y[k][c];
       
            }
        }

     return z;
    }


}
class Matrixmul
{
    public static void main(String[] args)
    {
        System.out.println("\n Enter the number or rows and columns in matrix A:\n");
        Scanner sn=new Scanner(System.in);
        int m=sn.nextInt();
        int n=sn.nextInt();
        int result[][]=new int[m][n];
        int A[][]=new int[m][n];
        System.out.println("Enter elements into matrix A:\n");
        for(int r=0;r<m;r++)
        for(int c=0;c<n;c++)
        A[r][c]=sn.nextInt();
        System.out.println("Enter the number or rows and columns in matrix B:\n");
        int p=sn.nextInt();
        int q=sn.nextInt();
        int B[][]=new int[p][q];
        System.out.println(" Enter elements into matrix B:\n");
        for(int r=0;r<p;r++)
        for(int c=0;c<q;c++)
        B[r][c]=sn.nextInt();
        Multiplication obj=new Multiplication();
        if(n==p)
        {

        obj.mul(A,B,result,m,n,p,q);
        for(int r=0;r<m;r++)
            {
        for(int c=0;c<n;c++)
                {
            System.out.print(result[r][c] +"\t");
                }
                System.out.print("\n");
            }
        }
            else
        System.out.println(" Matrix Multiplication Not Possible.");
       
    }
}

Output

 Enter the number or rows and columns in matrix A:

3 3
Enter elements into matrix A:

1 2 3
4 5 6
7 8 9
Enter the number or rows and columns in matrix B:

3 3
 Enter elements into matrix B:

1 2 3
6 7 8
4 5 6

25    31    37  
58    73    88  
91    115    139