cout

1. In C++, the standard input is from the keyboard, and the standard output is to the screen.
   
   
2. Standard input/output (I/O) can be accomplished using cin and cout as well as the operators << and >>.
   
   
3. These are all defined in the header file iostream. Thus one has to include the following preprocessor directive:
   
   #include <iostream>
   
   
4. The syntax for using cout is:
   
   cout << Variable_name;
   
   This displays the value stored in the variable "Variable_name" onto the screen.
   
   
5. Multiple output to the screen can be chained together:
   
   cout << Variable_1 << Variable_2 << ... ;