Nested function in C

Question

Can we have a nested function in C? What is the use of nested functions? If they exist in C does their implementation differ from compiler to compiler?

Answer 1

To answer your second question, there are languages that allow defining nested functions (a list can be found here: nested-functions-language-list-wikipedia).

In JavaScript, which is one of the most famous of those languages, one may of nested functions (which are called closures) are:

• To create class methods in constructors of objects.
• To achieve the functionality of private class members along with setters and getters.
• Not to pollute the global namespace (that goes for every language, of course).

to name a few...