Before getting into example, we should know what Intent service is in android. Intent Service is going to do back ground operation asynchronously. When user call startService() from activity , it doesn’t create instance for each request. It going to stop service after done some action in service class or ... Read More

Count inversion means the number of switches required to make an array sorted. Inversion count = 0, when array is sorted. Inversion count = maximum, when the array sorted in reverse order.Let us develop a C++ program to count Inversion in an Array.AlgorithmBegin    Function CountInversionArray has arguments a[], n ... Read More

You can add a unique constraint to a column using the ALTER TABLE commandSyntaxALTER TABLE table_name ADD CONSTRAINT MyUniqueConstraint UNIQUE(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 shown below:+--------------+--------------+------+-----+---------+-------+ | Field     ... Read More

You can add a not null constraint to a column of a table using the ALTER TABLE command.SyntaxALTER TABLE table_name MODIFY column_name datatype NOT NULL;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:+--------------+--------------+------+-----+---------+-------+ ... Read More

We shall develop a C++ program to find the median of two sorted arrays using Binary Search approach.AlgorithmBegin    Function median() with both the arrays and the start and end indexes of each array, which have two arrays and their respective elements as argument.       A) first calculate ... 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

You can add/set an auto increment constraint to a column in a table using the ALTER TABLE command.SyntaxALTER TABLE table_name ADD id INT PRIMARY KEY AUTO_INCREMENTAssume we have a table named Dispatches in the database with 7 columns namely id, CustomerName, DispatchDate, DeliveryTime, Price and, Location with description as shown ... 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 kind of derived class object. Virtual functions are resolved late, at runtime.The main use of virtual function is to achieve Runtime Polymorphism. Runtime polymorphism can ... Read More

Deleting a derived class object using a pointer to a base class, the base class should be defined with a virtual destructor.Example Code#include using namespace std; class b {    public:       b() {          cout