C++ Program to Multiply two Matrixes

Write a C++ Program to Multiply two Matrixes with an example. In this C++ matrix multiplication example, within the C++ nested for loop, we multiplied the subarr1 matrix with subarr2 and assigned it to multiplication. Next, we used cout to print the multiplication matrix items.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns;
	
	cout << "\nPlease Enter the Multiply Multi-Dimensional Array rows & Columns =  ";
	cin >> i >> j;
	
	int multarr1[i][j], multarr2[i][j], multiplication[i][j];
	
	cout << "\nPlease Enter the First Multi-Dimensional Array Items =  ";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < i; columns++) {
			cin >> multarr1[rows][columns];
		}		
	}	
	cout << "\nPlease Enter the Second Multi-Dimensional Array Items =  ";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < i; columns++) {
			cin >> multarr2[rows][columns];
		}		
	}
	cout << "\nThe Final Result after Multiplying multarr2 with multarr1\n";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < j; columns++) {
			multiplication[rows][columns] = multarr1[rows][columns] * multarr2[rows][columns];
			cout << multiplication[rows][columns] << " ";
		}
	}

 	return 0;
}

C++ Program to Multiply two Matrixes Example 2

In this C++ matrix multiplication example, we placed the cout statement to display the multiplication at each row and column iteration. Finally, we used one more nested for loop to print the multiplication matrix items.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns;
	
	cout << "\nPlease Enter the Multiply Multi-Dimensional Array rows & Columns =  ";
	cin >> i >> j;
	
	int multarr1[i][j], multarr2[i][j], multiplication[i][j];
	
	cout << "\nPlease Enter the First Multi-Dimensional Array Items =  ";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < i; columns++) {
			cin >> multarr1[rows][columns];
		}		
	}	
	cout << "\nPlease Enter the Second Multi-Dimensional Array Items =  ";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < i; columns++) {
			cin >> multarr2[rows][columns];
		}		
	}
	for(rows = 0; rows < i; rows++)	{
		cout << "\n---The Multiplication Result of " << rows + 1 << " Row Iteration---\n";
		for(columns = 0; columns < j; columns++) {
			multiplication[rows][columns] = multarr1[rows][columns] * multarr2[rows][columns];
			
			cout << "\nThe Multiplication Result of " << columns + 1 << " Column Iteration = ";
			cout << multarr1[rows][columns] << " * " << multarr2[rows][columns] << " = " << multiplication[rows][columns] << "\n";
		}
	}
	cout << "\nThe Final Result after Multiplying multarr2 with multarr1\n ";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < j; columns++) {
			cout << multiplication[rows][columns] << "  ";
		}
		cout<<"\n";
	}

 	return 0;
}

Output

Please Enter the Multiply Multi-Dimensional Array rows & Columns =  2 2

Please Enter the First Multi-Dimensional Array Items =  
10 20
30 40

Please Enter the Second Multi-Dimensional Array Items =  
3 4
5 6

---The Multiplication Result of 1 Row Iteration---

The Multiplication Result of 1 Column Iteration = 10 * 3 = 30

The Multiplication Result of 2 Column Iteration = 20 * 4 = 80

---The Multiplication Result of 2 Row Iteration---

The Multiplication Result of 1 Column Iteration = 30 * 5 = 150

The Multiplication Result of 2 Column Iteration = 40 * 6 = 240

The Final Result after Multiplying multarr2 with multarr1
 30  80  
150  240