C++ Programming – Lesson 1: Introduction and First Program

🔹 What is C++?

🟢 C++ is a powerful, fast, and flexible programming language widely used in:

• System software (e.g. operating systems)
• Game development
• Desktop applications
• Embedded systems

It is based on the C language, but with added support for object-oriented programming.

---

🛠️ Basic Structure of a C++ Program

Let’s start with the most basic program — printing “Hello, World!”:

#include <iostream>
using namespace std;

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

---

🧩 Code Explanation

Part	Meaning
#include <iostream>	Includes the input/output library (cin, cout, etc.)
using namespace std;	Allows writing cout instead of std::cout
int main()	Entry point of every C++ program
cout << "..." << endl;	Prints text to the console (endl adds a newline)
return 0;	Ends the program and returns 0 to the operating system (success signal)

---

✅ Output:

Hello, World!

---

🧠 Important Notes:

• Every C++ program starts from main()
• Statements must end with a semicolon ;
• cout is used to output text to the screen

---

🔜 Coming Up Next:

• Variables and Data Types (int, string, float, etc.)
• Conditional Statements (if, else)
• Loops (for, while)
• Functions
• Introduction to OOP (Object-Oriented Programming)