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Multiplying Two Numbers Using Consecutive Additions in C#

In this C# program, the user is asked to input two integer numbers. The program will then calculate their multiplication by using consecutive additions, rather than the traditional multiplication operator (*). This is a fundamental exercise in understanding how multiplication works under the hood, and it reinforces the concept of addition as the primary arithmetic operation.

To achieve this, the program will simulate the process of multiplication by repeatedly adding one number to itself the number of times equal to the other number. For example, multiplying 3 * 5 would be the same as adding 3 five times, i.e., 3 + 3 + 3 + 3 + 3 = 15.

This technique can be extended to handle larger numbers and provides a deeper understanding of basic math operations. This approach is important for understanding how computers might perform multiplication when more complex methods or constraints are required.



Group

C# Flow Control Basics

Objective

Write a C# program that asks the user for two integer numbers and shows their multiplication, but not using "*". It should use consecutive additions. (Hint: remember that 3 * 5 = 3 + 3 + 3 + 3 + 3 = 15)

Example C# Exercise

 Copy C# Code 
using System;

namespace ConsecutiveAdditionMultiplication
{
    class Program
    {
        static void Main(string[] args)
        {
            // Prompt the user to enter the first integer number
            Console.Write("Enter the first number: ");
            int num1 = int.Parse(Console.ReadLine()); // Read the first integer from the user

            // Prompt the user to enter the second integer number
            Console.Write("Enter the second number: ");
            int num2 = int.Parse(Console.ReadLine()); // Read the second integer from the user

            // Initialize the result variable to store the multiplication result
            int result = 0;

            // Perform the multiplication using consecutive additions
            // Add num1 to itself num2 times
            for (int i = 0; i < Math.Abs(num2); i++)
            {
                result += num1; // Add num1 to result, num2 times
            }

            // If num2 is negative, make the result negative as well
            if (num2 < 0)
            {
                result = -result; // Convert the result to negative if the second number was negative
            }

            // Display the result
            Console.WriteLine($"{num1} * {num2} = {result}");
        }
    }
}

 Output

//Example 1:
Enter the first number: 3
Enter the second number: 5
3 * 5 = 15

//Example 2:
Enter the first number: 7
Enter the second number: 4
7 * 4 = 28

//Example 3:
Enter the first number: 6
Enter the second number: -2
6 * -2 = -12

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More C# Practice Exercises of C# Flow Control Basics

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