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well c++ is concerned with computer, so first we should know what is computer how it works.
As u all know that "Computer is an electronic device which gives output only when we give instruction  to it" . The instruction we give is in the form of PROGRAM.
let me clear it Wha t is program?
PROGRAM: It is a sequence of instructions that can be executed by a computer or u can say that "a program is a set of an executable statement"
Every program is written in some programming language.C++ is one of the most powerful programming language available.


Now i stopping our discussion on c++ for a while.
As written above that computer works only when we give instruction to it, now think when we give power to CPU then computer starts functioning and after a minutes a window opens.
My question is that how it works or frm where it is instructed for this task
POWER GIVEN TO CPU->Booting takes place->AND COMPUTER OPENS
ANS IS--->>>when a  computer is manufactured ,at that time manufacturers install a software in a BIOS setup (basic  input output system) whis is read by non volatile temporary memory ROM.


A computer is consist of three layers:
1)Hardware
2)Systemsoftware(O.S. :-Windows,Linux...........................)
3)Applicationsoftware(Vlc,Adobe................................)
After that users come......................................................................................


Now u all know that computer reads  or understand machine language or binary language also called
low level language(OBJECT CODE) i.e.(0 1) for eg when we press 2 from keyboard then it is converted in to binary number  1 0  in the same way when we prees 15 then it is converted in to 1111 and  when we press  A then it is converted in to 1000001 because the ASCII code of A is 65. we will discuss later about ASCII code.....................
Binary language is called LOW LEVEL LANGUAGE , c/c++/java.............. are HIGH LEVEL LANGUAGE.
NOW my question is when computer reads binary language then why we study HIGH LEVEL LANGUAGE ans is it is not possible to remember all binary codings ..... for example binary number of
55856985648788874  this is too large and it is not possible to remember.