For iostream

Question

hello i am beginner in cop I have one question that without iostream we can use cout function

Answer 1

0) std::cout is an object of ostream (which is included in iostream header)
1) You can use cout without iostream, BUT you will have to include ostream header instead.
2) Nobody does (1). So just use iostream. :>

Answer 2

No

Answer 3

but I read in book that we can use

Answer 4

read this
https://msdn.microsoft.com/en-us/library/1z2f6c2k.aspx