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Practice & Resources

Practical Examples

// Add Two Numbers
int Add(int a, int b) => a + b;

// Reverse a String
string Reverse(string s) => new string(s.Reverse().ToArray());

// Check Palindrome
bool IsPalindrome(string s) => s == Reverse(s);

// FizzBuzz
for (int i = 1; i <= 100; i++) {
    if (i % 15 == 0) Console.WriteLine("FizzBuzz");
    else if (i % 3 == 0) Console.WriteLine("Fizz");
    else if (i % 5 == 0) Console.WriteLine("Buzz");
    else Console.WriteLine(i);
}

// Factorial
int Factorial(int n) => n <= 1 ? 1 : n * Factorial(n - 1);

Exercises

1. Write a program that counts vowels in a string
2. Create a class BankAccount with Deposit and Withdraw methods
3. Read a CSV file and calculate the average of a column
4. Build a simple to-do list app using List
5. Implement a generic method that swaps two values

Quiz Questions

• What is the difference between ref and out parameters?
• What is the purpose of the using statement?
• What is the difference between abstract class and interface?
• What does the var keyword do?

4-Week Study Plan

• Basics, variables, control flow, arrays, methods
• OOP, classes, inheritance, polymorphism
• Exceptions, file I/O, LINQ, generics
• Async, delegates, build a mini project

Resources

• Microsoft C# Documentation (learn.microsoft.com/dotnet/csharp)
• .NET Fiddle (dotnetfiddle.net) — online compiler
• C# Yellow Book by Rob Miles