import java.util.Scanner;
public class MultipleOfMatrix{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
System.out.println("enter the number of rows: ");
int r = in.nextInt();
System.out.println("enter the number of columns: ");
int c = in.nextInt();
int[][] m1 = new int[r][c];
int[][] m2 = new int[c][r];
int[][] m3 = new int[r][r];
System.out.println("Enter the numbers for the 1st matrix: ");
m1 = getNumOfMatrix(in, r, c, m1);
System.out.println("Enter the numbers for the 2nd matrix: ");
m2 = getNumOfMatrix(in, c, r, m2);
m3 = multiplyMatrix(r,r,c,m1,m2,m3);
System.out.println("1st matrix m1: ");
printMatrix(m1);
System.out.println("2nd matrix m2: ");
printMatrix(m2);
System.out.println("Multiplication of both the matrix m1 and m2: ");
printMatrix(m3);
}
public static int[][] getNumOfMatrix(Scanner in, int r, int c, int[][] m){
for(int i=0; i<r; i++){
for(int j=0; j<c; j++){
m[i][j] = in.nextInt();
}
}
return m;
}
public static int[][] multiplyMatrix(int r1, int c2, int c1,int[][] m1, int[][] m2, int[][] m3){
int sum=0;
for(int i=0; i<r1; i++){
for(int j=0; j<c2; j++){
sum=0;
for(int k=0; k<c1; k++){
sum = sum+m1[i][k]*m2[k][j];
}
m3[i][j] = sum;
}
}
return m3;
}
public static void printMatrix(int[][] m){
for(int[] i: m){
for(int j: i){
System.out.print(" "+j);
}
System.out.println();
}
}
}
Output-
enter the number of rows:
3
enter the number of columns:
2
Enter the numbers for the 1st matrix:
1
2
3
4
5
6
Enter the numbers for the 2nd matrix:
2
3
4
5
6
7
1st matrix m1:
1 2
3 4
5 6
2nd matrix m2:
2 3 4
5 6 7
Multiplication of both the matrix m1 and m2:
12 15 18
26 33 40
40 51 62
