C++ Program to Perform Scalar Matrix Multiplication

Write a C++ Program to Perform Scalar Matrix Multiplication with an example. This C++ scalar matrix multiplication program allows entering rows, columns, matrix items, and the multiplication number. Next, it uses a nested for loop to multiply each row and column with this number. And the final nested for loop is to print the Scalar Matrix Multiplication result.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns, number;
	
	cout << "\nPlease Enter the Matrix rows and Columns =  ";
	cin >> i >> j;
	
	int scalarMulArr[i][j], multi[i][j];
	
	cout << "\nPlease Enter the Matrix Items =  ";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < i; columns++) {
			cin >> scalarMulArr[rows][columns];
		}		
	}
	
	cout << "\nPlease Enter the Multiplication Value\n";
 	cin >> number;
 	
	for(rows = 0; rows < i; rows++)
  	{
  		for(columns = 0; columns < j; columns++)
  		{
  			multi[rows][columns] = number * scalarMulArr[rows][columns];
		}
  	}

 	cout << "\nThe Result of a Scalar Matrix Multiplication is :\n";
	for(rows = 0; rows < i; rows++)
  	{
  		for(columns = 0; columns < j; columns++)
  		{
  			cout << multi[rows][columns] << " ";
		}
		cout << "\n"; 
  	}  	

 	return 0;
}

C++ Program to Perform Scalar Matrix Multiplication Example 2

Instead of using another nested for loop to display the Scalar Matrix Multiplication result, we used cout (cout << multi[rows][columns] << ” “;) within the same loop.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns, number;
	
	cout << "\nPlease Enter the Matrix rows and Columns =  ";
	cin >> i >> j;
	
	int scalarMulArr[i][j], multi[i][j];
	
	cout << "\nPlease Enter the Matrix Items\n";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < i; columns++) {
			cin >> scalarMulArr[rows][columns];
		}		
	}
	
	cout << "\nPlease Enter the Multiplication Value = ";
 	cin >> number;
 	
 	cout << "\nThe Result of a Scalar Matrix Multiplication is :\n";
	for(rows = 0; rows < i; rows++)
  	{
  		for(columns = 0; columns < j; columns++)
  		{
  			multi[rows][columns] = number * scalarMulArr[rows][columns];
  			cout << multi[rows][columns] << " ";
		}
		cout << "\n"; 
  	}  	

 	return 0;
}

Please Enter the Matrix rows and Columns =  3 3

Please Enter the Matrix Items
11 22 33
44 55 66
77 88 99

Please Enter the Multiplication Value = 8

The Result of a Scalar Matrix Multiplication is :
88 176 264 
352 440 528 
616 704 792 

In this C++ scalar matrix multiplication example, we used extra cout statements to show you the row, column, and multiplication values at each iteration.

#include<iostream>
using namespace std;

int main()
{
	int i, j, rows, columns, number;
	
	cout << "\nPlease Enter the Matrix rows and Columns =  ";
	cin >> i >> j;
	
	int scalarMulArr[i][j], multi[i][j];
	
	cout << "\nPlease Enter the Matrix Items\n";
	for(rows = 0; rows < i; rows++)	{
		for(columns = 0; columns < i; columns++) {
			cin >> scalarMulArr[rows][columns];
		}		
	}
	
	cout << "\nPlease Enter the Multiplication Value = ";
 	cin >> number;
 	
	for(rows = 0; rows < i; rows++)
  	{
  		cout << "\nRow Iteration = " << rows + 1 << ", Row Number = " << rows;
  		for(columns = 0; columns < j; columns++)
  		{
  			cout << "\nColumn Iteration = " << columns + 1 << ", Column Number = " << 
			  	columns << ", and Row Number = " << rows;
			
  			multi[rows][columns] = number * scalarMulArr[rows][columns];
  			cout <<  "\nscalarMulArr["<<rows<<"]["<< columns <<"] = " << scalarMulArr[rows][columns] << 
			" and number * scalarMulArr["<<rows<<"]["<< columns <<"] = " << multi[rows][columns] << endl;
		}
  	}  	
  	
  	cout << "\nThe Result of a Scalar Matrix Multiplication is :\n";
	for(rows = 0; rows < i; rows++)
  	{
  		for(columns = 0; columns < j; columns++)
  		{
  			cout << multi[rows][columns] << " ";
		}
		cout << "\n"; 
  	} 

 	return 0;
}

Please Enter the Matrix rows and Columns =  2 2

Please Enter the Matrix Items
10 20
30 40

Please Enter the Multiplication Value = 9

Row Iteration = 1, Row Number = 0
Column Iteration = 1, Column Number = 0, and Row Number = 0
scalarMulArr[0][0] = 10 and number * scalarMulArr[0][0] = 90

Column Iteration = 2, Column Number = 1, and Row Number = 0
scalarMulArr[0][1] = 20 and number * scalarMulArr[0][1] = 180

Row Iteration = 2, Row Number = 1
Column Iteration = 1, Column Number = 0, and Row Number = 1
scalarMulArr[1][0] = 30 and number * scalarMulArr[1][0] = 270

Column Iteration = 2, Column Number = 1, and Row Number = 1
scalarMulArr[1][1] = 40 and number * scalarMulArr[1][1] = 360

The Result of a Scalar Matrix Multiplication is :
90 180 
270 360