Why have header files and .cpp files? [closed]

Answer 1

Responding to MadKeithV's answer,

This reduces dependencies so that code that uses the header doesn't necessarily need to know all the details of the implementation and any other classes/headers needed only for that. This will reduce compilation times, and also the amount of recompilation needed when something in the implementation changes.

Another reason is that a header gives a unique id to each class.

So if we have something like

class A {..};
class B : public A {...};

class C {
    include A.cpp;
    include B.cpp;
    .....
};

We will have errors, when we try to build the project, since A is part of B, with headers we would avoid this kind of headache...