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Compatible C89 / C90, C99 and C11

I just read: C Wikipedia entry . As far as I know, there are 3 different versions of C that are widely used: C89, C99, and C11. My question is about the compatibility of the source code of different versions. Suppose I am going to write a program (in C11, since this is the latest version) and import a library written in C89. Will these two versions work correctly when compiling all files according to the C11 specification?

Question 1 : Are later versions of C ie C99, C11 supernets of older versions of C? By superset, I mean that the old code will compile without errors of the same value when compiling in accordance with the new C specifications.

I just read that // has different meanings in C89 and C99. Besides this feature, are there C99 and C11 C89 supersets?

If the answer to question 1 is not, then I have 2 more questions.

  • How to transfer old code to new versions? Is there a document that explains this procedure?

  • Is it better to use C89 or C99 or C11?

Thanks for your help in advance.

EDIT : changed ISO C to C89.

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4 answers

Are later versions of C ie C99, C11 superset of older versions of C?

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Source: https://habr.com/ru/post/1666164/

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