The readability of C depends on who wrote the code. It's not hard to find code which uses abbreviated variables all on one line, no comments, bad formatting, monolithic, copious use of MACROS, pointer abuse and all the rest to make unreadable code. Indeed, the international obfuscated C contest shows how easy it is to write utterly meaningless code which somehow does something.
And C++ adds it's own layer of fun. Templates are the work of the devil - get an arg wrong e.g. miss a const or a (de)reference, and the compiler might throw a wall consisting of hundreds of errors back at you. Not intuitive at all and certain not easy to step debug.
Doesn't mean the answer is Pascal but C/C++ was never designed for readability and any that exists is by the grace of the person who wrote the code rather than inherent to the language. Other languages do try a lot harder to enforce readability in the file structure and in the code itself. Python would be most famous for it but even enforcing filename = classname, path = namespace as seen in Java / C# gives more structure than you get in C.