• PM_ME_VINTAGE_30S [he/him]@lemmy.sdf.org
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    7 months ago

    Running #define ; anything yields error: macro names must be identifiers for both C and C++ in an online compiler. So I don’t think the compiler will let you redefine the semicolon.

    • fubarx
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      7 months ago

      Haha. Thanks for checking. Given the C pre-processor, I’m sure there’s a way to maliciously bork it if someone sets their mind to it.

      • PM_ME_VINTAGE_30S [he/him]@lemmy.sdf.org
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        7 months ago

        Well I just tried #define int void in C and C++ before a “hello world” program. C++ catches it because main() has to be an int, but C doesn’t care. I think it is because C just treats main() as an int by default; older books on C don’t even include the “int” part of “int main()” because it’s not strictly necessary.

        #define int void replaces all ints with type void, which is typically used to write functions with no return value.