In this section we will see what is the RTTI (Runtime Type Information) in C++. In C++ the RTTI is a mechanism, that exposes information about an object’s datatype during runtime. This feature can be available only when the class has at least one virtual function. It allows the type ... Read More

You can add a primary key constraint to a column of a table using the ALTER TABLE command.SyntaxALTER TABLE table_name ADD CONSTRAINT MyPrimaryKey PRIMARY KEY (column1, column2...);Assume we have a table named Dispatches in the database with 7 columns namely id, CustomerName, DispatchDate, DeliveryTime, Price and, Location with description as ... Read More

We shall develop a C++ program to find kth smallest element by the method of partitioning the Array.AlgorithmBegin    Function CreatePartition() has an array a, and the lower l and upper limit h as arguments    in := l and pi := h    for i in range l to ... Read More

One of the best frameworks for developing crawlers is scrapy. Scrapy is a popular web scraping and crawling framework utilizing high-level functionality to make scraping websites easier.Installation Installing scrapy in windows is easy: we can use either pip or conda(if you have anaconda). Scrapy runs on both python 2 and 3 ... Read More

You can drop a constraint on a column of a table using the ALTER TABLE command.SyntaxALTER TABLE table_name DROP CONSTRAINT MyUniqueConstraint;Assume we have a table named Dispatches in the database with 7 columns namely id, CustomerName, DispatchDate, DeliveryTime, Price and, Location with description as shown below:+--------------+--------------+------+-----+---------+-------+ | Field     ... Read More

In data structure Link List is a linear collection of data elements. Each element or node of a list is comprising of two items - the data and a reference to the next node. The last node has a reference to null. In a linked list the entry point is ... Read More

In data structure, Linked List is a linear collection of data elements. Each element or node of a list is comprising of two items - the data and a reference to the next node. The last node has a reference to null. Into a linked list the entry point is ... Read More

Virtual functions in C++ use to create a list of base class pointers and call methods of any of the derived classes without even knowing the kind of derived class object. Virtual functions are resolved late, at the runtime.If A virtual function in a base class declared as once a ... Read More

This example demonstrate about How to add custom view in alert dialogStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.     In the ... Read More

This example demonstrate about How to get the duplicates values from Arraylist and then get those items in another Arraylist.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following ... Read More