The Istream used for header providing the standard input and combined input/output stream classes.
The class templates of istream should be as follows −
|1||basic_istream||It is used in an Input stream|
|2||basic_iostream||It is used in an Input/output stream|
The classes of istram should be as follows.
|1||istream||It is used in an Input stream|
|2||iostream||It is used in an Input/output stream|
|3||wistream||It is used in an Input stream (wide)|
|4||wiostream||It is used in an Input/output stream (wide)|
|1||ws||It is used to extract whitespaces|