Explicit value assignment in C Sharp (C#) - Mini Project: Build & Apply

Explicit Value Assignment in C#

📖 Scenario: Imagine you are organizing a small library system. You want to assign specific ID numbers to some books so you can find them easily later.

🎯 Goal: You will create a dictionary to store book titles with their explicit ID numbers, then print the dictionary to see the assignments.

📋 What You'll Learn

Create a dictionary called bookIds with exact book titles as keys and their explicit ID numbers as values.

Create a variable called newBookId and assign it the value 105.

Add a new book with the title "The Hobbit" and the ID stored in newBookId to the dictionary.

Print the bookIds dictionary to show all book titles and their IDs.

💡 Why This Matters

🌍 Real World

Assigning explicit IDs to items like books helps organize and find them quickly in real systems like libraries or inventory management.

💼 Career

Understanding explicit value assignment and dictionary usage is important for software developers working with data storage, lookup tables, and configuration settings.

1

Create the initial dictionary with explicit values

Create a dictionary called bookIds with these exact entries: "1984": 101, "Brave New World": 102, "Fahrenheit 451": 103.

C Sharp (C#)

// Your code here

Need a hint?

Use new Dictionary<string, int> { {"key", value}, ... } to create the dictionary with explicit values.

2

Add a new explicit value variable

Create an integer variable called newBookId and assign it the value 105.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Dictionary bookIds = new Dictionary
        {
            {"1984", 101},
            {"Brave New World", 102},
            {"Fahrenheit 451", 103}
        };
        // Your code here
    }
}

Need a hint?

Use int newBookId = 105; to assign the explicit value.

3

Add a new book with explicit ID to the dictionary

Add a new entry to the bookIds dictionary with the key "The Hobbit" and the value from the variable newBookId.

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Dictionary bookIds = new Dictionary
        {
            {"1984", 101},
            {"Brave New World", 102},
            {"Fahrenheit 451", 103}
        };
        int newBookId = 105;
        // Add new book here
    }
}

Need a hint?

Use bookIds["The Hobbit"] = newBookId; to add the new entry.

4

Print the dictionary to show all book IDs

Use a foreach loop with variables title and id to iterate over bookIds. Inside the loop, print each book title and its ID in the format: "{title}: {id}".

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Dictionary bookIds = new Dictionary
        {
            {"1984", 101},
            {"Brave New World", 102},
            {"Fahrenheit 451", 103}
        };
        int newBookId = 105;
        bookIds["The Hobbit"] = newBookId;
        // Print all book IDs
    }
}

Need a hint?

Use foreach (var kvp in bookIds) and Console.WriteLine($"{kvp.Key}: {kvp.Value}") to print each entry.