Question

What are streams in c++? what are predefined streams in c++?

Answer 1

We can define stream as a sequence of characters.

Predefined Streams are : cin, cout, cerr, clog which are defined in <iostream> header file.

Answer 2

Answer:

The predefined streams in C++ are Cin - standard input, Cout - standard output, Cerr - Standard error output, and Clog - buffered version.

Explanation:

C++ has a more number of predefined streams and these predefined streams are also called as standard input and output objects.

The most commonly used predefined streams are Cin and Cout.  

Cin - Standard Input Stream - Usually the input device is a keyboard and the instance class for Cin is Istream. It is usually read the input from the keyboard.

Cout - Standard Output Stream - Usually the out devices displays in the screen and the instance class for Cout is Ostream. It passes the data to the output device and it displayed in the monitor.

Cerr - Standard error output stream - It controls unbuffered output data, catches the errors and passes it to output device of monitor.

Clog - It is used to control buffer.