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What is iostream.h in C++ Programing Language ?

In C++ programing language, all header files end with .H extension. In standard C++, all devices are accessed and used as a file. 

One such header file is iostream.h in C++ programming language. In this, all input and output devices are treated as files. 

Let's quickly look at what are the input and output devices mean in C++ program. 

Standard Input Device

- Keyboard 

Standard Output Device 

- Monitor 

Standard Error Device

- Screen or monitor

In C++, input and output are not defined within, and are implemented with the help of a component of the C++ standard library which is I/O library. 

A file is read simply as a stream of bytes at the lowest level. But at a user level, a file consists of possibly mixed data types which can be characters, arithmetic values class, objects etc. 

What are the predefined streams in I/O Library?

As discussed above there are input, output and error library in c++, they have some predefined streams objects as well which are used in the code. Let's have a look at them. 

Standard Input - For standard input in c++, cin is defined as istream class object. cin stands for console input.

Standard output - For standard output in c++, cout is defined as ostream class object. 

Standard Error - For standard error in c++, cerr is defined as ostream class object. 

The declarations and functions of all three - cin, cout, and cerr are contained within the iostream.h header file. 
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