C++ is a powerful programming language used for system programming, game development, and performance-critical applications. It's more complex than Python, but it gives you more control and better performance.

This course will teach you C++ from scratch. By the end, you'll be able to write basic C++ programs and understand the fundamentals.

Why Learn C++?

C++ is used for:

• Game development (Unreal Engine, many games)
• System programming (operating systems, drivers)
• High-performance applications
• Embedded systems
• Financial software

It's harder than Python, but it's faster and gives you more control over memory and hardware.

Setting Up C++

You need a compiler to run C++ code:

Windows: Install MinGW or use Visual Studio (free Community edition)

Mac: Install Xcode Command Line Tools: xcode-select --install

Linux: Install g++: sudo apt install g++

Or use an online compiler like onlinegdb.com or repl.it to get started without installing anything.

Lesson 1: Your First C++ Program

Create a file called hello.cpp and type:

#include <iostream>
using namespace std;

int main() {
    cout << "Hello, World!" << endl;
    return 0;
}

Compile and run:

• Windows (MinGW): g++ hello.cpp -o hello.exe then hello.exe
• Mac/Linux: g++ hello.cpp -o hello then ./hello

What it means:

• #include <iostream> - includes input/output library
• using namespace std; - lets you use std functions without "std::"
• int main() - the main function where your program starts
• cout - outputs text
• return 0; - indicates successful execution

Lesson 2: Variables and Data Types

C++ requires you to specify variable types:

int age = 25;
double height = 5.9;
char grade = 'A';
string name = "Alice";
bool isStudent = true;

cout << "Name: " << name << endl;
cout << "Age: " << age << endl;

Common types:

• int - integers
• double - decimal numbers
• char - single characters
• string - text (need #include <string>)
• bool - true/false

Lesson 3: Input and Output

Get input from the user:

string name;
int age;

cout << "What's your name? ";
cin >> name;

cout << "How old are you? ";
cin >> age;

cout << "Hello, " << name << "! You are " << age << " years old." << endl;

cin reads input. cout outputs text. << sends data to output, >> gets data from input.

Lesson 4: If Statements

Make decisions in your code:

int age;
cout << "Enter your age: ";
cin >> age;

if (age >= 18) {
    cout << "You are an adult" << endl;
} else {
    cout << "You are a minor" << endl;
}

// Multiple conditions
if (age >= 90) {
    cout << "A" << endl;
} else if (age >= 80) {
    cout << "B" << endl;
} else if (age >= 70) {
    cout << "C" << endl;
} else {
    cout << "F" << endl;
}

C++ if statements work like Python, but you need parentheses around conditions and curly braces around code blocks.

Lesson 5: Loops

Repeat code with loops:

// For loop
for (int i = 0; i < 5; i++) {
    cout << i << endl;
}

// While loop
int count = 0;
while (count < 5) {
    cout << count << endl;
    count++;
}

// Do-while loop (runs at least once)
int num;
do {
    cout << "Enter a positive number: ";
    cin >> num;
} while (num <= 0);

i++ means "increment i by 1" (same as i = i + 1). Loops work similarly to Python, but syntax is different.

Lesson 6: Arrays

Arrays store multiple values:

// Create an array
int numbers[5] = {1, 2, 3, 4, 5};

// Access elements (starts at 0)
cout << numbers[0] << endl;  // 1
cout << numbers[2] << endl;  // 3

// Loop through array
for (int i = 0; i < 5; i++) {
    cout << numbers[i] << " ";
}

Arrays in C++ are fixed size. For dynamic arrays, use vectors (we'll cover those later).

Lesson 7: Functions

Functions let you reuse code:

// Function declaration
int add(int a, int b) {
    return a + b;
}

// Function with no return value
void greet(string name) {
    cout << "Hello, " << name << "!" << endl;
}

// Use them
int result = add(5, 3);
cout << result << endl;  // 8

greet("Alice");  // Hello, Alice!

Functions need a return type (int, void, etc.). void means the function doesn't return anything.

Common Mistakes Beginners Make

• Forgetting semicolons: Every statement needs a semicolon at the end
• Wrong data types: Make sure variable types match what you're storing
• Array bounds: Arrays start at 0, and going out of bounds causes errors
• Missing includes: Need to include libraries for things like string
• Compilation errors: Read error messages - they usually tell you what's wrong

What's Next?

Now that you know the basics:

• Learn about pointers and memory management
• Learn about classes and object-oriented programming
• Learn about the Standard Template Library (STL)
• Build projects
• Move on to intermediate C++

Practice is key. Write code, make mistakes, fix them, learn from them.