Functions inside functions in C [duplicate]

Answer 1

In the event you were wondering how to turn off GCC extensions and such.

You can use the -ansi flag which essentially sets the standard to c89, and turns off GCC features which are incompatible with ISO C90.

See the docs for more information. Check out the -std flag too.

Answer 2

You are using nested functions - C does not support such things.

Answer 3

Nested functions are available as a language extension in GCC, but they are not part of the standard language, so some compilers will not allow them.

Answer 4

local function definitions inside a function are illegal in C.

Answer 5

That is not a valid C code, inner functions are not supported in C

Answer 6

Nested functions are not part of the C standards. There is therefore no guarantee that it will work for all compilers and should definitely be avoided.