Скачать или смотреть Mastering Programming With C++ | (#04 Understanding “using namespace std” + return 0 Explained)

Welcome back to another session of “Mastering Programming With C++ – 2025 Edition”!
In the last video, we wrote our first real C++ program and explored what things like #include, main, and cout mean.

In this session, we’ll continue breaking down our code — and this time, we’ll focus on two very important (but often confusing) parts of every beginner program:
👉 using namespace std;
👉 return 0;

💡 What you’ll learn in this video:

What “namespace” actually means in programming

Why we often see using namespace std; at the top of C++ programs

The role of “std” and what happens if we remove it

The advantages and disadvantages of using “using namespace std”

When you should use it — and when you shouldn’t

What “return 0;” inside main() actually does

The idea of exit codes and what they tell the operating system

How the compiler treats your program’s end result when you return a value

🧠 By the end of this video:

You’ll clearly understand what’s happening when you write these lines —
not just copy them blindly like most beginners do.

You’ll know:

Why we write using namespace std;

What it really does behind the scenes

And why return 0; is a small but important signal that your program ran successfully

🎯 This is where your understanding of syntax turns into real programming knowledge — because from now on, every piece of code you write will finally make sense.

If you haven’t watched the previous episode about the first C++ code structure, make sure to check it out first — it’s the foundation for what we’re explaining today.

And as always, don’t forget to like, subscribe, and follow the playlist to continue your journey toward mastering C++ step by step 💻✨

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