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

No you can't have a nested function in C. The closest you can come is to declare a function inside the definition of another function. The definition of that function has to appear outside of any other function body, though.

E.g.

void f(void)
{
    // Declare a function called g
    void g(void);

    // Call g
    g();
}

// Definition of g
void g(void)
{
}