Please could you explain how fragmented programs can be brought together.

Question

In object oriented programming, parts of a program can be made differrently, fragmented by different people and later brought together. please how does it apply to web design and applications .please can someone explain ?

Answer 1

in application it appears that for example:
there is a big project, lets say it is a program for MCdolan. one man would not write the whole, it will be a pain tho. so it is split. one team is rssposible for the app where you can buy things, the other for payment stationlike thing and another for that fancy program that show orders.
laater in every team every person have one thing that is involved in the whole lets say app for buying. cause it is not just "buy", it needs a database of products, a paragon generator and a module that is rensponsible for sending things back to another program. so each person writes one module, then it is testend and put in together to make an app.
it is like in car building where you dont get a full car from one company, instead there are a lot of companies involved cause there is a raduo from one, wheels from others etc etc.
in web design you have a lot of sub-webs in you web so one man can make one of it, like "gallery" and the other maybe "menu" or another "blog"

Answer 2

ooh thanks bro. I appreciate

Answer 3

thanks bro. but when you mean join code, are you actually referring to copying the code for a part(fragment) and pasting it in the main code

Answer 4

no no, i mean each person writes a funcion, a method that do something and in a main programm they just reffer to it.
somefunc1(arg1);
otherfunc(par1, arg2);
func(anotherfunc4());
and each is just take from a library or class written by other person