Declaring a function?

Question

in C I am writing some of my very first exercises. Earlier on, I tried to declare a simple function inside of main and it comes with an error: "function definition is not allowed here". But I thought a function could be declared inside of main or outside, the only difference being the scope?? I have also read, in here, of other people writing functions inside of main, so why won't it let me do it? thanks

You should show your code, otherwise nobody can help you. But note that in C you cannot *define* a function inside another. — Renzo, Nov 01 '15 at 22:39
http://stackoverflow.com/questions/957592/functions-inside-functions-in-c — Rob, Nov 01 '15 at 22:41

score 3 · Answer 1 · answered Nov 01 '15 at 22:40

You can declare a function inside another function:

int main(void) {
    int foo(int); // declaration
    ...
}

But you can't define a function inside another function:

int main(void) {
    // Doesn't work.
    int foo(int x) {
        return x * 2;
    }
    ...
}

Also, declaring functions inside other functions is a really unusual thing to do, and essentially never necessary.

Declaring a function?

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