02A-2016 – Computer Sir Ki Class

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Exam Questions-CBSE12D-2016-02A #CPP#6154    siteicon   siteicon  

Problem Statement - 02A-2016

Differentiate between Constructor and Destructor functions giving suitable example using a class in C++. When does each of them execute?

Solution

TC++ #6154

PART 1:

Constructor Destructor
A constructor function has same name as the class A destructor function has same name as the class preceded by ~ symbol
Example:
class Exam
{
  int Eno; float Marks;
public:
  Exam()    //Constructor
  {
    Eno=1; Marks = 100;
    cout<<”Constructor executed...”<<endl;
  }
  void Show()
  {
    cout<<Eno<<”#”<<Marks<<endl;
  }
  ~Exam()    //Destructor
  {
    cout<<”Exam Over”<<endl;
  }
};
void main()
{
  Exam E;    //Executes constructor
  E.Show();

PART 2:
Execution of Constructor and Destructor:

Constructor Destructor
A constructor executes by itself at the time of object creation A destructor executes by itself when the scope of an object ends


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CSKC| Created: 10-Jan-2019 | Updated: 16-Jan-2019|CBSE12D-2016









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Introductory Sessions Beginning to Program Tokens Keyword and Identifiers Data Types Variables and Constants Operators Simple User Input Building Expressions and Formulas Simple Real World Problems Simple If and If Else Multiple-Nested-Ladder of If Else Switch case selection Simple Loops Tricks in Loops - break continue scope Loop Applications - Handling numerals Series printing loops Nested Loops Pattern printing loops Number Varieties and Crunches String Handling (Null Terminated) Strings - string class type Functions (Built-in) Functions - user defined Functions Reference Passing/Returning Arrays Concepts and 1-D Arrays Array Data Management Two dimensional arrays and Matrices Structures Basics Structures passing/returning 2D Array Memory Addressing Display Using IO Manipulation Display Using C Formatting Tricks User Defined Data Types Enumerated Types Preprocessor Directives And Macros Exception Handling Programming Paradigms and OOPs Advantages Abstraction and Encapsulation Polymorphism Inheritance Function Overloading Concepts Function Overloading Varieties Function Overloading Special Cases Defining Classes Creating and Using Class Objects Class Members Accessibility Class Function Types Inline Functions Constant Functions Nesting of Functions Class Members Scope Resolution Static Members in a Class Array of Objects Constructor Concepts Default Constructor Parameterized Constructor Copy Constructor Constructor Overloading Destructors Inheritance Fundamentals Public Derivations Private and Protected Derivations Multiple Inheritance Multi-Level Inheritance Class Nesting Data File Concepts Handling Text Files Handling Binary Files Pointer Concepts Pointer and Arrays Pointers and Functions Object Pointers This Pointer Linked Lists Stacks Queues


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