The principles you learn from Stroustrup are worth far more than the $50–$90 you might “save” by downloading an illegal PDF. Invest in your education. Your future C++ code will thank you. Have you found a legit, open-source alternative to this textbook? Check out "C++ Crash Course" by Josh Lospinoso or "Learn C++ Through Projects" – but for deep fundamentals, Stroustrup’s text remains unmatched.
And if you have searched for it online, you have likely typed exactly this phrase into your browser: The principles you learn from Stroustrup are worth
If you are learning C++—truly learning it, not just skimming through syntax—you have almost certainly encountered the holy grail of modern programming textbooks: "Programming: Principles and Practice Using C++" by Bjarne Stroustrup (the creator of C++ itself). The 4th Edition, updated for C++20/23, is the gold standard. Have you found a legit, open-source alternative to