What is cin

Answer 1

Cin is used for input in C++
cin is C input
Cout is C output

Answer 2

Cross-reference definition of 'cout' from language author:
http://www.stroustrup.com/bs_faq2.html#cout

Answer 3

cin used to input whatever you want..
cin>>"My Name is Meher Ali;
I things this type statement using in c++...