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🎯 C# Variables & User Input Project

Lesson Snapshot

Learn to store information in variables and create interactive programs that talk to users! (Ages 8-18)

Folder & File Map

VariablesAndInput/
├── .git/
├── .gitignore
├── VariablesAndInput.csproj
└── Program.cs

Step-by-Step Build Guide

1. Fork and Clone the Repository ✅

  • What to do: Go to https://github.com/PhillyCoderDojo/session2-variables → Click "Fork" → Open GitHub Desktop → Clone your fork to your computer
  • Where we're working: Making your own copy of today's starter project
  • Code snippet: None
  • Why it matters: You get your own playground to experiment in
  • Git command: git clone https://github.com/YOUR-USERNAME/session2-variables.git
  • 📸 SCREENSHOT: Fork button in top right, then GitHub Desktop clone dialog

2. Open Project in Rider ✅

  • What to do: Open Rider → File → Open → Navigate to your cloned folder → Select it → Click OK
  • Where we're working: Loading your project into the coding tool
  • Code snippet: None
  • Why it matters: Time to start coding!
  • Git command: None
  • 📸 SCREENSHOT: Rider with project loaded in Solution Explorer

3. Create Your First Variable 📦

  • What to do: Open Program.cs and type these lines
  • Where we're working: Program.cs file
  • Code snippet:
string myName = "Alex";
Console.WriteLine("Hello, " + myName);
  • Why it matters: Variables are like boxes that hold information
  • Git command: git add . && git commit -m "Add first string variable"
  • 📸 SCREENSHOT: Code editor showing the variable declaration

4. Add Number Variables 🔢

  • What to do: Add these lines below your name code
  • Where we're working: Program.cs file
  • Code snippet:
int myAge = 12;
double myHeight = 5.5;
Console.WriteLine($"I am {myAge} years old and {myHeight} feet tall");
  • Why it matters: Different boxes (variables) hold different types of things
  • Git command: git add . && git commit -m "Add integer and double variables"
  • 📸 SCREENSHOT: Code showing all three variable types

5. Get User Input 💬

  • What to do: Replace your code with this interactive version
  • Where we're working: Program.cs file
  • Code snippet:
Console.Write("What is your name? ");
string userName = Console.ReadLine();
Console.WriteLine($"Nice to meet you, {userName}!");
  • Why it matters: Programs become fun when they respond to users
  • Git command: git add . && git commit -m "Add user input for name"
  • 📸 SCREENSHOT: Console showing the prompt and user typing

6. Ask for Age 🎂

  • What to do: Add this code to ask for the user's age
  • Where we're working: Program.cs file (add after name code)
  • Code snippet:
Console.Write("How old are you? ");
string ageText = Console.ReadLine();
int userAge = int.Parse(ageText);
Console.WriteLine($"Wow! In 10 years you'll be {userAge + 10}!");
  • Why it matters: Converting text to numbers lets us do math
  • Git command: git add . && git commit -m "Add age input with calculation"
  • 📸 SCREENSHOT: Console showing age calculation result

7. Build Profile Questionnaire 📋

  • What to do: Create a complete profile program
  • Where we're working: Replace all code in Program.cs
  • Code snippet:
Console.WriteLine("=== Profile Builder ===");

Console.Write("Enter your name: ");
string name = Console.ReadLine();

Console.Write("Enter your age: ");
int age = int.Parse(Console.ReadLine());

Console.Write("Enter your favorite color: ");
string color = Console.ReadLine();

Console.Write("Do you like pizza? (yes/no): ");
bool likesPizza = Console.ReadLine().ToLower() == "yes";

Console.WriteLine("\n=== Your Profile ===");
Console.WriteLine($"Name: {name}");
Console.WriteLine($"Age: {age}");
Console.WriteLine($"Favorite Color: {color}");
Console.WriteLine($"Likes Pizza: {likesPizza}");
  • Why it matters: Combining everything into a real program
  • Git command: git add . && git commit -m "Create complete profile questionnaire"
  • 📸 SCREENSHOT: Full program output with user responses

8. Push Your Branch 🚀

  • What to do: In GitHub Desktop → Click "Push origin" to upload your branch
  • Where we're working: Sending your code to GitHub
  • Code snippet: None
  • Why it matters: Backs up your work and prepares for sharing
  • Git command: git push origin my-variables
  • 📸 SCREENSHOT: GitHub Desktop showing successful push

Run & Test ▶️

  • Press Ctrl+F5 or click the green ▶️ button
  • Answer all the questions when prompted
  • Common Error: "Input string was not in a correct format" - happens when typing letters for age
  • Fix: Make sure to type only numbers when asked for age

Bonus Challenge 🔥

Create a Personal Calculator that asks for two numbers and shows all math operations!

Hint:

Console.Write("First number: ");
double num1 = double.Parse(Console.ReadLine());
Console.Write("Second number: ");
double num2 = double.Parse(Console.ReadLine());
Console.WriteLine($"{num1} + {num2} = {num1 + num2}");
// Add subtraction, multiplication, division!

Super Stretch: Use int.TryParse() to handle bad input:

if (int.TryParse(Console.ReadLine(), out int result))
{
    Console.WriteLine($"You entered: {result}");
}
else
{
    Console.WriteLine("That's not a number!");
}