
 
The Istream used for header providing the standard input and combined input/output stream classes.
The class templates of istream should be as follows −
| Sr.No. | Stream | Definition | 
|---|---|---|
| 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.
| Sr.No. | Classes | Definition | 
|---|---|---|
| 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) | 
| Sr.No. | Functions | Definition | 
|---|---|---|
| 1 | ws | It is used to extract whitespaces |