This book is a companion for learning the C++ programming language. It presents some significant concepts, applied to an example, a multiple balls collision simulator, which will run in real-time in a multi-thread structure. The book explains the program. The goal is to make possible to the reader its improvement or even application to other fields. This book is neither a complete nor a simplified course. The objective is to be a complementary tool. Examples extending the program include the simplified simulations of a planet and its satellite and the creation of a fictional universe. The elementary simulation of a satellite launching is also possible and is a challenge to the reader, who needs to find the correct parameters. Therefore, this book is also helpful for teaching and studying physics (Newtonian mechanics).