"" and <> are same ?

hi thanks
forgive me i ask here
does there is a Difference between #include"isosream" and #include<iostream> there is no difference i use "" or <> in my all #includes?
example:#include<conio.h> #include"conio.h" ?
and there is no difference between cout <<120; and cout <<"120"; ?
if i want print \n not create new line how can i do that ? i mean print \n in monitor screen
what is difference between getch() and _getch() ?
Here's a little reading for you, these will answer at least two of your questions.
http://cplusplus.com/doc/tutorial/preprocessor/##include
http://cplusplus.com/doc/tutorial/constants/
thanks alot moorecm
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