Object type as universal base in C Sharp (C#) - Mini Project: Build & Apply

Using Object Type as Universal Base in C#

📖 Scenario: Imagine you are creating a simple program that stores different types of items in one place. These items can be numbers, words, or even true/false values. You want to keep them all together in a list.

🎯 Goal: You will build a C# program that uses the object type to store different kinds of data in one list. Then, you will print each item to see how it works.

📋 What You'll Learn

Create a list called items that can hold object types

Add an int, a string, and a bool to the list

Use a foreach loop with variable item to go through items

Print each item inside the loop

💡 Why This Matters

🌍 Real World

Using <code>object</code> as a universal base type helps when you want to store or pass around different kinds of data together, like in collections or APIs.

💼 Career

Many programming jobs require handling mixed data types safely and flexibly. Understanding <code>object</code> helps you write code that works with any data type.

1

Create a list to hold objects

Create a list called items that can hold object types.

C Sharp (C#)

using System.Collections.Generic;

// Create the list called items
// Your code here

Need a hint?

Use List<object> to create a list that can hold any type of data.

2

Add different types of items to the list

Add these exact items to the items list: the integer 42, the string "hello", and the boolean true.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List items = new List();
        // Add 42, "hello", and true to items
        // Your code here
    }
}

Need a hint?

Use items.Add(value) to add each item to the list.

3

Loop through the list and print each item

Use a foreach loop with variable item to go through the items list and print each item inside the loop.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List items = new List();
        items.Add(42);
        items.Add("hello");
        items.Add(true);

        // Loop through items and print each item
        // Your code here
    }
}

Need a hint?

Use foreach (object item in items) to loop, then Console.WriteLine(item) to print.

4

Display the output

Run the program to display the output of the items list printing.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List items = new List();
        items.Add(42);
        items.Add("hello");
        items.Add(true);

        foreach (object item in items)
        {
            Console.WriteLine(item);
        }
    }
}

// Run the program to see the output

Need a hint?

The program should print each item on its own line: 42, hello, True.