Installing C++ Compiler and Setup

# CHAPTER 2

Installing C++ Compiler and Setup #

1. Introduction #

2. Learning Objectives #

• Understand the role of the g++ compiler.

• Install MinGW (GCC/G++) on Windows.

• Configure Environment Variables.

• Install and set up Visual Studio Code for C++.

• Compile and run a basic C++ program using the terminal.

3. What is a Compiler? #

[Source Code (main.cpp)] ---> [COMPILER (g++)] ---> [Executable (main.exe)] ---> OS runs it

4. Installing the Compiler (MinGW on Windows) #

Steps:

1. 1. Download MSYS2 from msys2.org.

1. 2. Install it and open the MSYS2 terminal.

1. 3. Run this command to install the GCC toolchain:

   pacman -S mingw-w64-ucrt-x86_64-gcc
   ```
4. Now, you must add the compiler to your Windows **PATH**.
   - Search for "Environment Variables" in the Windows start menu.
   - Click "Edit the system environment variables".
   - Find the `Path` variable, click Edit, and add: `C:\msys64\ucrt64\bin`.
   - Click OK and save.

*(Note: Mac users can simply run `xcode-select --install` in the terminal to get the Clang compiler. Linux users can run `sudo apt install g++`)*.

### 5. Verifying the Installation
Open Command Prompt (cmd) or PowerShell and type:

bash g++ --version

If you see a version number (like `g++ (GCC) 13.1.0`), your compiler is ready!

### 6. Setting up the IDE (VS Code)
An IDE (Integrated Development Environment) makes writing code much easier. **Visual Studio Code** is the industry standard.

1. Download and install VS Code from `code.visualstudio.com`.
2. Open VS Code, go to Extensions (Ctrl+Shift+X).
3. Search for and install the **"C/C++"** extension by Microsoft.
4. Optional: Install the **"Code Runner"** extension for a quick "Play" button to run code.

*(Alternatives: Visual Studio Community (heavy but powerful), CLion (paid), Code::Blocks).*

### 7. Compiling and Running Manually
Create a file named `hello.cpp` and type the following:

cpp #include <iostream>

int main() { std::cout << "Compiler is working!" << std::endl; return 0; }

Open the terminal in VS Code (Terminal -> New Terminal) and run:

bash # Compile the code (-o names the output file) g++ hello.cpp -o hello.exe

# Run the executable .\hello.exe `` *Output:* Compiler is working!

• Using gcc instead of g++: gcc is for C. g++ is for C++. If you use gcc on a C++ file, it won't link the standard C++ libraries correctly.

• Forgetting to update PATH: If the terminal says 'g++' is not recognized, your PATH environment variable is incorrect.

• Spaces in file paths: Save your code in folders without spaces (e.g., C:\CppProjects\) to avoid terminal errors.

1. 1. Verify your g++ installation in the terminal.

15. Next Chapter Recommendation #