how to create multiple files for cpp when not using classes

Question

i m doing functional programming so i m not using classes. How can i have separate source file what to define in the header file and how.
Example would be helpful

Answer 1

You can use separate files for function prototypes and definitions. In the header file, you will have the prototype:

int timesTwo (int a);

And in the .cpp file you will have the definiton:

int timesTwo (int a) {
return 2 * a;
)

Of course then you will have to include the header file in main, as well as include the cpp file in the header file.