C and C++ have noticeable differences, despite a common origin, and should be treated as different languages. For C, many people recommend Gustedt's "Modern C"

C and C++ have noticeable differences, despite a common origin, and should be treated as different languages. For C, many people recommend Gustedt's "Modern C" which is available in print but has a free ebook version (https://gustedt.gitlabpages.inria.fr/modern-c/ https://gustedt.gitlabpages.inria.fr/modern-c/). For C++, Stroustrup's "A Tour of C++" seems to be well liked.