Introduction to C++

C++ is a powerful, general-purpose programming language that was developed by Bjarne Stroustrup in 1979 at Bell Labs. It was originally called "C with Classes" and was later renamed C++ in 1983. The name C++ itself comes from the increment operator ++ in C, meaning it is an enhanced version of C.

C++ supports multiple programming styles — procedural, object-oriented, and generic programming — making it one of the most flexible languages ever created. It is widely used in systems programming, game development, embedded systems, real-time applications, browsers, databases, and much more.

Why Learn C++?

C++ sits very close to the hardware while still offering high-level programming features. This combination makes it uniquely powerful:

• Performance: Programs written in C++ run extremely fast because the code compiles directly to machine instructions.
• Control: Developers have fine-grained control over memory and system resources.
• Versatility: Used in game engines (like Unreal Engine), operating systems, browsers (Chrome, Firefox), databases (MySQL), and financial systems.
• Foundation: Learning C++ builds a strong base for understanding Java, C#, Python, and almost every other language.
• Industry demand: C++ professionals are highly sought after in system programming, game development, and finance sectors.

Where is C++ Used?

C vs C++ — Key Differences

C is the parent language of C++. C++ includes everything C has, but adds:

• Object-Oriented Programming (OOP) features — Classes, Objects, Inheritance
• Function overloading
• References
• Templates
• Exception handling
• Standard Template Library (STL)

How C++ Works — Compilation Process

Unlike Python or JavaScript (which run line by line), C++ is a compiled language. This means the source code is first converted into machine code before execution.

The steps are:

1. Write: Developer writes C++ source code in a .cpp file.
2. Preprocess: The preprocessor handles directives like #include.
3. Compile: The compiler converts source code into object code (.obj or .o).
4. Link: The linker combines object files and libraries into an executable.
5. Run: The resulting executable program runs on the machine.

First Look at a C++ Program

Here is the simplest possible C++ program that prints a message to the screen:

#include <iostream>
using namespace std;

int main() {
    cout << "Welcome to C++ Programming!" << endl;
    return 0;
}

Output:

Welcome to C++ Programming!

Breaking It Down Line by Line

• #include <iostream> — Tells the program to include the Input/Output library so printing to screen works.
• using namespace std; — Allows using standard library features without typing std:: every time.
• int main() — The starting point of every C++ program. Execution begins here.
• cout << "..." — Prints the text inside the quotes to the screen.
• endl — Moves the cursor to a new line.
• return 0; — Signals that the program ended successfully.

C++ Standards Timeline

C++ has evolved over the years with major standard updates:

• C++98 / C++03 — First standardized version
• C++11 — Massive update with lambdas, smart pointers, range-based for loops
• C++14 — Minor improvements over C++11
• C++17 — Structured bindings, filesystem library, if constexpr
• C++20 — Concepts, ranges, coroutines, modules
• C++23 — Latest standard with more improvements

Key Takeaways

• C++ is a compiled, statically-typed, high-performance language.
• It supports procedural, object-oriented, and generic programming.
• It is used in high-performance and resource-critical applications.
• Every C++ program starts execution from the main() function.