Virtual Function and Pure Virtual Function De

A virtual function is a member function in a base class that can be redefined in a derived class. A pure virtual function is a member function in a base class whose declaration is provided in a base class and implemented in a derived class. The classes which are containing virtual functions are not abstract classes.

Unformatted and formatted I/O in C++

C++ provides both the formatted and unformatted IO functions. In formatted or high-level IO, bytes are grouped and converted to types such as int , double , string or user-defined types. In unformatted or low-level IO, bytes are treated as raw bytes and unconverted.

Packages in JAVA

Package in java can be categorized in two form, built-in package and user-defined package. There are many built-in packages such as java, lang, awt, javax, swing, net, io, util, sql etc.

function of Swing components in Java

Swing in java is part of Java foundation class which is lightweight and platform independent. It is used for creating window based applications.