Prototype?

Question

Functions, a function can be called before declaration.
If it is prototyped

Answer 1

The declaration is the prototype.

Answer 2

A function can be declared but not prototyped dependent on its position in relation to the int main

Answer 3

For example.
Void fhdj();//prototype

Int main(){
fhdj();
}

Void fhdj(){//declaration
}

Next program

Void hdjd(){//declaration
}

Int main(){
hdjd();
}