Nested Functions in C

Yes, you read the title right. No, I’m not crazy , OK maybe a bit (no pun intended). Maybe I’m sleep deprived, I honestly don’t remember when was the last time I had a good night’s sleep but it is true, C does support nested functions, All that you learnt about C was wrong (Gasp!!) Don’t trust me? Fine, go ahead and try the following code out.


         int main()

           void foo () {}return 0;


  GCC compiles it without a hitch. See, I told you! (again, no pun intended)I search around and figured out that ANSI ( C99 ) does not allow for nested functions. However, an addon for GCC provides support for it. I haven’t checked out its scoping rules or made any progress along that path. Do let me know if you find this out.



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Hi!, My name is Gokula Krishnan, you can (and I prefer) call me gokul. I'm a third year Computer Science major from BITS Pilani. I'm interested in Technology, Theoretical Computer Science and Discrete Mathematics. A FOSS enthusiast, I'm one of the founders of the BITS Firefox community. I'm currently working on Big Data Analytics, Machine learning and UNIX shell programming. My not-so-geeky hobbies include playing volleyball and football and origami

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