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Asked: 2026-06-14T03:12:34+00:00

I am just learning programming really, and, while reading C++ Primer Plus (5th Ed.),

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I am just learning programming really, and, while reading C++ Primer Plus (5th Ed.), I came across the statement that “any valid C program is a valid C++ program” and I am curious to see how far I can take that statement.

The book is pretty good, but is that statement necessarily true?

Is there any reason to not create a new file in CodeBlocks and choose that it be a C++ file despite my intentions of writing only C code for a particular project, instead of choosing to call it a C file? For example, maybe I will start writing something in C and realize down the road that I want to start using some of the C++ features, would it not have mattered what I decided in the beginning since I can just change the file extension afterwards?

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1 Answer

  1. Editorial Team

    The statement is outright false. There are plenty of C programs that are not valid C++ programs, and I would go so far as to say that any non-trivial C program that’s properly written is not a valid C++ program. Hint: char *p = malloc(n); is not valid C++.

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