why do we need separate files for headers and source code?

Answer 1

talk about OOP! Thanj you! :)

Answer 2

Imagine a scenario where you being a game developer or any programmer at all using C++ had to code for a game, a program, an app, but then discovered you needed some files to include functionality to the screen. Functionality for the mouse. Not only would your source code be heavy but it would consume developmental time. So the general schema is to separate functionality from content, content from styling and so on.

Answer 3

Try to do a project in one file and you'll see why ;)

Answer 4

Imagine a main contain 3000 line of code you'll be capable to read It or to modify it

Answer 5

The only reason is tidiness. It keeps the program neat looking so that it's easier to search for the source of bugs in your code. Also makes your code run faster, and makes it easier to add or delete features.