Why does this code snippet compile ?

Question

Why does the following code compile?

#include <stdio.h>

int main(void) {
    getchar;
}

Answer 1

The same reason 1; would compile, getchar is just an address to a function. The result is evaluated, then discarded. In the language specification, it's called an "expression statement";

Answer 2

Because function names are aliases to function pointers to those functions, which are themselves values much like integers.. This is semantically very similar to

#include <stdio.h>

int main(void) {
    42;
}

It is valid but pointless.