matrixMultiply.java

//Question: Write a program to print the multiplication of two matrices given by users.
package twoDArray;
import java.util.Scanner;
public class matrixMultiply {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n1, m1, n2, m2;
        System.out.print("Enter the number of rows and columns of the first array: ");
        m1=sc.nextInt();
        n1=sc.nextInt();
        System.out.print("Enter the number of rows and columns of the second array: ");
        m2=sc.nextInt();
        n2=sc.nextInt();
    if(n1==m2){
        int[][] arr1=new int[m1][n1];
        int[][] arr2=new int[m2][n2];
        int[][] mul=new int[m1][n2];
        System.out.println("Enter the elements of the first array: ");
      for (int i = 0; i <m1 ; i++) {
        for (int j = 0; j < n1; j++) {
            arr1[i][j]=sc.nextInt();
        }
      }
       System.out.println("Enter the elements of the second array: ");
      for (int i = 0; i <m2 ; i++) {
        for (int j = 0; j < n2; j++) {
            arr2[i][j]=sc.nextInt();
        }
      }
      
      for (int i = 0; i <m1; i++) {
        for (int j = 0; j <n2; j++) {
           mul[i][j] = 0;
        for (int k = 0; k < n1; k++) {
            mul[i][j] += arr1[i][k] * arr2[k][j];
        }
            System.out.print(mul[i][j]+" ");
        }
        System.out.println();
      }
    }else{System.out.println("Multiplication cannot be done!");}
    }
}