What is the difference between C and C++ programming languages

Let’s consider the following C++ program which prints “Hello World” on to the console or terminal window. We will look at various elements used in the program. 1 2 3 4 5 6 7 8 //C++ program to print “Hello World” #include <iostream> using namespace std; int main() { cout<<“Hello World”; return 0; } Output of the above code is: 1 Hello World   In the above program, iostream is the name of a header file which contains I/O functionality. In order to take input and print some output using our C++ program, we have to include that header file

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What is the difference between C and C++ programming languages
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What is formatted and unformatted data in C++

Data which is received by the program without any modifications and sent to the output device without any modifications is known as unformatted data. On the other hand, sometimes we may want to apply some modifications to the actual data that is being received or sent. For example, we might want to display an integer in hexadecimal format in the output, leave some whitespace when printing a number and adjustments in the decimal point. Such modified data in known as formatted data.   As an example for formatted data, if we want to display a decimal number in hexadecimal format,

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What is formatted and unformatted data in C++
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How to access object members in C++

After creating an object, we can access the data and functions using the dot operator as shown below: object-name.variable-name; (or) object-name.function-name(params-list);   Based on our student class example, we can access the get_details() function as shown below: std1.get_details(); std2.get_details();   The complete program which demonstrates creating class, creating objects, and accessing object members is as follows: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

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How to access object members in C++
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Different types of constructors in Programming

A constructor can be classified into following types: Dummy constructor Default constructor Parameterized constructor Copy constructor Dynamic constructor   Dummy Constructor   When no constructors are declared explicitly in a C++ program, a dummy constructor is invoked which does nothing. So, data members of a class are not initialized and contains garbage values. Following program demonstrates a dummy constructor: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 #include <iostream> using namespace std; class Student { private: string name; string regdno; int age;

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Different types of constructors in Programming
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How does sessions work in servlets

A session is a collection of HTTP requests, over a period of time, between a client and server. Maintaining the data within the session is known as session tracking. For example, maintaining the book details added to the cart in an online book shop application. Session tracking mechanisms include the following: URL rewriting (query strings) Hidden form fields Cookies HTTP session (Session objects)   URL Rewriting   In this method we keep track of the data by passing the data as a query string from one page to another page. A query string starts with ? symbol and is followed

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How does sessions work in servlets
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How to perform event handling in javascript

The programming which allows computations based on the activities in a browser or by the activities performed by the user on the elements in a document is known as event-driven programming. An event is the specification (essentially an object created by the browser and JavaScript) of something significant has occurred. Examples of events are click, submit, keyup etc. In JavaScript all the event names are specified in lowercase. An event handler (essentially a function) is a set of statements (code) that handles the event. Below table lists most commonly used events and their associated tag attributes: Event Tag Attribute blur

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How to perform event handling in javascript
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How to create and execute servlet manually

A servlet is a normal java class which follows these set of rules: Should be a public non-abstract class. Should be a subtype of servlet.Servlet interface or  HttpServlet  class. Should contain a zero or no argument constructor. The inherited methods from the Servlet interface should not be declared as final.   Following are the basic steps for creating and executing a servlet: Create a HTML page (optional) Create the Servlet file Create the web.xml (deployment descriptor) file Deploy the application   Creating a HTML Page   First thing we will do is create a HTML page called index.html with the

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How to create and execute servlet manually
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