Introduction to g++

g++ is a command-line tool used for compiling and linking C++ code. It is part of the GNU Compiler Collection (GCC) and is the default C++ compiler on most Linux systems.

Installation

If you're on a Linux system, chances are g++ is already installed. You can check by running the following command in your terminal:

g++ --version

If g++ is not installed, you can install it using your system's package manager. For example, on Ubuntu or Debian based systems, you can install it using the following command:

sudo apt-get install g++

Usage

Once you have g++ installed, you can use it to compile your C++ code. For example, let's say you have a file called my_program.cpp, you can compile it using the following command:

g++ my_program.cpp -o my_program

The -o option specifies the output file name, which in this case is my_program. If you don't specify an output file name, g++ will create a file called a.out.

You can also specify additional options to g++ to customize the compilation process. For example, you can specify the C++ version you want to use:

g++ my_program.cpp -o my_program -std=c++17

This command tells g++ to use the C++17 standard.

Conclusion

g++ is a powerful tool for compiling and linking C++ code. With a few simple commands, you can compile your code and create executable files. If you're new to C++, g++ is a great place to start.