Interactive Number Input with Commands in C#

In this exercise, you will create an interactive C# program that allows users to enter an unlimited number of numeric values. Additionally, the user will be able to execute specific commands to interact with the list of entered numbers. The program will support the following commands:

- "sum": Displays the total sum of all entered numbers.
- "view": Displays all numbers entered so far.
- "end": Exits the program.

The user will repeatedly be prompted to enter a number or a command. If a number is entered, it will be stored in a list. If a valid command is entered, the program will execute the corresponding operation.

This exercise will help you practice handling user input, managing lists dynamically, and implementing basic command-based logic in C#.Date

Group

Dynamic Memory Management in C#

Objective

1. Continuously prompt the user for a number or a command.
2. If the user enters a number, store it in a list.
3. If the user enters "sum", display the sum of all numbers entered so far.
4. If the user enters "view", display all the numbers entered.
5. If the user enters "end", terminate the program.
6. Ensure the program can handle both numbers and commands correctly.

Create a program to allow the user to enter an unlimited amount of numbers. Also, they can enter the following commands:

- "sum", to display the sum of all the numbers entered so far.
- "view", to display all the numbers entered.
- "end", to quit the program.

This is an execution sample:

Number or command? 5  

Number or command? 3  

Number or command? view  



Entered numbers:  

5  

3  



Number or command? 6  

Number or command? sum  

Sum = 14  

Number or command? -7  

Number or command? end

Example C# Exercise

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using System;
using System.Collections.Generic; // Import the namespace for list management

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int>(); // Create a list to store entered numbers
        string input; // Variable to store user input

while (true) // Infinite loop to keep asking for input
        {
            Console.Write("Number or command? "); // Prompt the user for input
            input = Console.ReadLine(); // Read user input

if (input == "end") // Check if the user wants to exit
            {
                break; // Exit the loop and terminate the program
            }
            else if (input == "sum") // Check if the user wants to sum all numbers
            {
                int sum = 0; // Initialize sum variable
                foreach (int num in numbers) // Iterate through the list
                {
                    sum += num; // Add each number to the sum
                }
                Console.WriteLine("Sum = " + sum); // Display the sum
            }
            else if (input == "view") // Check if the user wants to view entered numbers
            {
                Console.WriteLine("\nEntered numbers:"); // Display heading
                foreach (int num in numbers) // Iterate through the list
                {
                    Console.WriteLine(num); // Print each number
                }
                Console.WriteLine(); // Print an empty line for readability
            }
            else // Assume the input is a number
            {
                if (int.TryParse(input, out int number)) // Try to convert input to an integer
                {
                    numbers.Add(number); // Add the number to the list
                }
                else // If input is not a valid number or command
                {
                    Console.WriteLine("Invalid input. Please enter a number or a valid command.");
                }
            }
        }
    }
}

using System;
using System.Collections.Generic; // Import the namespace for list management

class Program
{
    static void Main()
    {
        List numbers = new List(); // Create a list to store entered numbers
        string input; // Variable to store user input

        while (true) // Infinite loop to keep asking for input
        {
            Console.Write("Number or command? "); // Prompt the user for input
            input = Console.ReadLine(); // Read user input

            if (input == "end") // Check if the user wants to exit
            {
                break; // Exit the loop and terminate the program
            }
            else if (input == "sum") // Check if the user wants to sum all numbers
            {
                int sum = 0; // Initialize sum variable
                foreach (int num in numbers) // Iterate through the list
                {
                    sum += num; // Add each number to the sum
                }
                Console.WriteLine("Sum = " + sum); // Display the sum
            }
            else if (input == "view") // Check if the user wants to view entered numbers
            {
                Console.WriteLine("\nEntered numbers:"); // Display heading
                foreach (int num in numbers) // Iterate through the list
                {
                    Console.WriteLine(num); // Print each number
                }
                Console.WriteLine(); // Print an empty line for readability
            }
            else // Assume the input is a number
            {
                if (int.TryParse(input, out int number)) // Try to convert input to an integer
                {
                    numbers.Add(number); // Add the number to the list
                }
                else // If input is not a valid number or command
                {
                    Console.WriteLine("Invalid input. Please enter a number or a valid command.");
                }
            }
        }
    }
}

Output

Number or command? 5  
Number or command? 3  
Number or command? view  

Entered numbers:  
5  
3  

Number or command? 6  
Number or command? sum  
Sum = 14  
Number or command? -7  
Number or command? end

Example Code Copied

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Interactive Number Input with Commands in C#

Group

Dynamic Memory Management in C#

Objective

Example C# Exercise

Output

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