Array methods (Sort, Reverse, IndexOf) in C Sharp (C#) - Mini Project: Build & Apply

Array methods (Sort, Reverse, IndexOf)

📖 Scenario: You are organizing a list of book titles for a small library. You want to sort the titles alphabetically, reverse the order, and find the position of a specific book.

🎯 Goal: Build a program that creates an array of book titles, sorts them, reverses the order, and finds the index of a given book.

📋 What You'll Learn

Create an array of strings called books with these exact titles: "C# Basics", "Learn Java", "Python Guide", "Web Development", "Data Science"

Create an integer variable called index to store the position of the book "Python Guide"

Use Array.Sort to sort the books array alphabetically

Use Array.Reverse to reverse the order of the books array

Use Array.IndexOf to find the index of "Python Guide" in the reversed array

Print the sorted array, the reversed array, and the index of "Python Guide"

💡 Why This Matters

🌍 Real World

Sorting and searching lists is common in apps like libraries, stores, and contact lists.

💼 Career

Knowing array methods helps you manage collections of data efficiently in software development.

1

Create the array of book titles

Create an array of strings called books with these exact titles: "C# Basics", "Learn Java", "Python Guide", "Web Development", "Data Science"

C Sharp (C#)

# Your code here

Need a hint?

Use string[] books = { ... }; to create the array with the exact titles.

2

Create the index variable

Create an integer variable called index to store the position of the book "Python Guide". Initialize it to -1 for now.

C Sharp (C#)

string[] books = { "C# Basics", "Learn Java", "Python Guide", "Web Development", "Data Science" };
# Your code here

Need a hint?

Use int index = -1; to create the variable before finding the actual position.

3

Sort and reverse the array, find the index

Use Array.Sort(books) to sort the books array alphabetically. Then use Array.Reverse(books) to reverse the order. Finally, use Array.IndexOf(books, "Python Guide") to find the index of "Python Guide" in the reversed array and store it in index.

C Sharp (C#)

string[] books = { "C# Basics", "Learn Java", "Python Guide", "Web Development", "Data Science" };
int index = -1;
# Your code here

Need a hint?

Call Array.Sort and Array.Reverse on books. Then find the index with Array.IndexOf.

4

Print the results

Print the sorted array, the reversed array, and the index of "Python Guide". Use Console.WriteLine and a foreach loop to print the arrays. Print the index with a descriptive message.

C Sharp (C#)

string[] books = { "C# Basics", "Learn Java", "Python Guide", "Web Development", "Data Science" };
int index = -1;
Array.Sort(books);
Array.Reverse(books);
index = Array.IndexOf(books, "Python Guide");

# Your code here

Need a hint?

Use a foreach loop to print each book. Then print the index with Console.WriteLine.