Question

Multiply two integer matrices and print both the original matrices and resultant matrix.

Enter Row size of 1st matrix:
2
Enter Column size of 1st matrix:
3
Enter Row size of 2nd matrix:
3
Enter Column size of 2nd matrix:
4
Enter Elements in First Matrix:
1
2
3
4
5
6
Enter Elements in Second Matrix:
1
2
3
4
5
6
7
8
9
10
11
12
Matrix 1:
1 2 3
4 5 6
Matrix 2:
1 2 3 4
5 6 7 8
9 10 11 12
Matrix 1 * Matrix 2:
38 44 50 56
83 98 113 128

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Code

import java.util.Scanner;
public class MatrixMultiplication
{
    public static void main()
    {
        int[ ][ ] matrix1,matrix2,ProductOfFirstAndSecondMatrix;
        int row1,col1,row2,col2,product,sum=0;
        int i,j,k;
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter Row size of 1st matrix:");
        row1=sc.nextInt();
        System.out.println("Enter Column size of 1st matrix:");
        col1=sc.nextInt();
        System.out.println("Enter Row size of 2nd matrix:");
        row2=sc.nextInt();
        System.out.println("Enter Column size of 2nd matrix:");
        col2=sc.nextInt();
        if(col1!=row2)
        {
            System.out.println("Column of the First matrix should be equal to row of second matrix");
        }
        else
        {
            matrix1=new int[row1][col1];
            matrix2=new int[row2][col2];
            ProductOfFirstAndSecondMatrix=new int[row1][col2];
            System.out.println("Enter Elements in First Matrix:");
            for(i=0;i< row1;i++)
            {
                for(j=0;j< col1;j++)
                {
                    matrix1[i][j]=sc.nextInt();
                }
            }
            System.out.println("Enter Elements in Second Matrix:");
            for(i=0;i< row2;i++)
            {
                for(j=0;j< col2;j++)
                {
                    matrix2[i][j]=sc.nextInt();
                }
            }

            for(i=0;i< row1;i++)
            {
                for(j=0;j< col2;j++)
                {
                    k=0;
                    while(k< col1)
                    {
                        product=matrix1[i][k]*matrix2[k][j];
                        sum=sum+product;
                        k++;
                    }
                    ProductOfFirstAndSecondMatrix[i][j]=sum;
                    sum=0;
                }

            }

            System.out.println("Matrix 1:");
            for(i=0;i< row1;i++)
            {
                for(j=0;j< col1;j++)
                {
                    System.out.print(matrix1[i][j]+" ");

                }
                System.out.println();
            }

            System.out.println("Matrix 2:");
            for(i=0;i< row2;i++)
            {
                for(j=0;j< col2;j++)
                {
                    System.out.print(matrix2[i][j]+" ");

                }
                System.out.println();
            }
            System.out.println("Matrix 1 * Matrix 2:");
            for(i=0;i< row1;i++)
            {
                for(j=0;j< col2;j++)
                {
                    System.out.print(ProductOfFirstAndSecondMatrix[i][j]+" ");

                }
                System.out.println();
            }
        }
    }
}