Matrix multiplication using java coding

Similar to addition we can also write multiplication coding in java.
The program explains you.



import java.io.*;

class matrmul

{

 public static void main(String args[])throws IOException

{

int i,n,m,j,x,y,a[][],b[][],c[][];

           

DataInputStream br =new DataInputStream(System.in);

System.out.println("Enter the number of rows for A");

m=Integer.parseInt (br.readLine());

System.out.println("Enter the number of columns for A");

n=Integer.parseInt (br.readLine());

a=new int[m][n];

System.out.println("Enter the A array Elements");

  for (i=0; i<m; i++)

  {

    for (j=0;j<n;j++)

    {

      a[i][j]=Integer.parseInt(br.readLine());

    }

  }

System.out.println("Enter the number of rows for B");

x=Integer.parseInt (br.readLine());

System.out.println("Enter the number of columns for B");

y=Integer.parseInt (br.readLine());

b=new int[x][y];

System.out.println("Enter the B array Elements");

  for (i=0; i<m; i++)

  {

   for (j=0;j<n;j++)

   {

     b[i][j]=Integer.parseInt(br.readLine());

   }

  }

 

if(n==x)                                                                                                           

{

c=new int[m][y];

for(int i =0; i<m;i++)

            {

   for(j=0;j<y;j++)

             {

             for(int k =0; k<y;k++)

              {                                                      c[i][j]= c[i][j]+a[i][k]*b[k][j];

              }

             }

 }

 for(i=0;i<m;i++)

 {

    for(j=0;j<y;j++)

     {

      System.out.println(c[i][j]+"/t");

      }                                                        System.out.println("/n");

 }

}

else

{System.out.println("Matrix Multiplication is not possible");

}

}

}

OUTPUT

C:\Documents and Settings\dcom358>H:

H:\>cd java

H:\Java>path=C:\jdk1.3\bin;

H:\Java>javac matrmul.java

Note: matrmul.java uses or overrides a deprecated API.

Note: Recompile with -deprecation for details.

H:\Java>java matrmul                                      

Enter the number of rows for A

2

Enter the number of columns for A

2

Enter the A array Elements

1

2

3

4

Enter the number of rows for B

2

Enter the number of columns for B

2

Enter the B array Elements

1

2

3

4

Product is

7

10

15

22