/*

* PROGRAM : To multiply two matrices using your own method. Print the resultant along with two input matrices.

* FILE : MultiplyTwoMatrix.java

* CREATED BY : Santosh Hembram

* DATE : 12-10-20

*/

import java.util.*;

class MatrixMul {

public void multiplyMatrix(int matrix[][], int matrix2[][]) {

int mulResult[][] = new int[matrix.length][matrix2[0].length];

for (int i=0; i<matrix.length; i++) {

for (int j=0; j<matrix[0].length; j++) {

mulResult[i][j] = 0;

for(int k=0; k<matrix2.length; k++) {

mulResult[i][j] = mulResult[i][j] + matrix[i][k] * matrix2[k][j];

}

}

}

System.out.println("----- Displaying the resultant matrix -------");

for (int i=0; i<matrix.length; i++) {

for (int j=0; j<matrix[0].length; j++) {

System.out.print(mulResult[i][j]+" ");

}

System.out.println();

}

}

}

class MultiplyTwoMatrix {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.print("Enter the row size for 1st matrix: ");

int r = sc.nextInt();

System.out.print("Enter the coloumn size for 1st matrix: ");

int c = sc.nextInt();

int mat[][] = new int[r][c];

System.out.println("---------- Enter the elements of the 1st matrix --------------");

for(int i=0; i<r; i++) {

for (int j=0; j<c; j++) {

System.out.print("Enter the elements for row "+i+" coloumn "+j+": ");

mat[i][j] = sc.nextInt();

}

}

System.out.print("Enter the row size for 2nd matrix: ");

int r2 = sc.nextInt();

System.out.print("Enter the coloumn size for 2nd matrix: ");

int c2 = sc.nextInt();

while (r2!=c) {

System.out.println("WARNING!!!");

System.out.println("The row size must be same with the first Matrix column size !!!!!!!!!!!!!!");

System.out.print("Again enter the coloumn size for 2nd matrix: ");

c2 = sc.nextInt();

}

int mat2[][] = new int[r2][c2];

System.out.println("--------- Enter the elements of the 2nd matrix --------------");

for(int k=0; k<r2; k++) {

for (int l=0; l<c2; l++) {

System.out.print("Enter the elements for row "+k+" coloumn "+l+": ");

mat2[k][l] = sc.nextInt();

}

}

System.out.println("------- Displaying the 1st Matrix ----------");

for( int i=0; i<r; i++) {

for ( int j=0; j<c; j++) {

System.out.print(mat[i][j]+" ");

}

System.out.println();

}

System.out.println("------- Displaying the 2nd Matrix ----------");

for( int k=0; k<r2; k++) {

for ( int l=0; l<c2; l++) {

System.out.print(mat2[k][l]+" ");

}

System.out.println();

}

MatrixMul obj = new MatrixMul();

obj.multiplyMatrix(mat,mat2);

}

}