Constructor and Types of Constructors

Apr 10, 2019Download as pptx, pdf4 likes5,781 views

This Presentation is helpful to study about constructor and its different types. It is also used in make presentation about this topic.

Topic
Constructor and Types of Constructor

Contain
• Overview of Constructor
• Properties of Constructor
• Types of Constructor
1. Default Constructor
2. Parameterized Constructor
3. Copy Constructor

Constructor
• A constructor is a “special” member function which initializes the
objects of class.

Properties of Constructor
• Constructor is invoked automatically whenever an object of class is created.
• Constructor name must be same as class name.
• Constructors should be declared in the public section because private
constructor cannot be invoked
• outside the class so they are useless.
• Constructors do not have return types and they cannot return values, not
even void.
• Constructors cannot be inherited, even though a derived class can call the
base class constructor.
• Constructors cannot be virtual.
• An object with a constructor cannot be used as a member of a union.
• They make implicit calls to the operators new and delete when memory
allocation is required.

Types of Constructors
• There are mainly three types of constructors as follows:
1. Default Constructor
2. Parameterized Constructor
3. Copy Constructor

Default Constructor
• Default constructor is the one which invokes by default when
object of the class is created.
• It is generally used to initialize the value of the data members.
• It is also called no argument constructor.

Example
class integar
{
int m,n;
public:
integer() // Default constructor
{
m=n=0;
}
};

Parameterized Constructor
• Constructors that can take arguments are called parameterized
constructors.
• Sometimes it is necessary to initialize the various data elements of
different objects with different values when they are created.
• We can achieve this objective by passing arguments to the
constructor function when the objects are created.

Example
class integer
{
int m,n;
public:
integer(int x,int y) // Parameterized constructor
{
m =x;
n=y;
}
};

Copy Constructor
• A copy constructor is used to declare and initialize an object from
another object.
• For example, integer(integer &i); OR integer I2(I1);
• Constructor which accepts a reference to its own class as a
parameter is called copy constructor.

Example
class integer
{
int m, n;
public:
integer(rectangle &x) // Copy constructor
{
m = x.m;
n = x.n;
}
};

Thank You
#include<iostream>
using namespace std;
int main()
{
cout << “Thank You”;
return 0;
}

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Constructor and Types of Constructors

2. Topic Constructor and Types of Constructor

3. Contain • Overview of Constructor • Properties of Constructor • Types of Constructor 1. Default Constructor 2. Parameterized Constructor 3. Copy Constructor

4. Constructor • A constructor is a “special” member function which initializes the objects of class.

5. Properties of Constructor • Constructor is invoked automatically whenever an object of class is created. • Constructor name must be same as class name. • Constructors should be declared in the public section because private constructor cannot be invoked • outside the class so they are useless. • Constructors do not have return types and they cannot return values, not even void. • Constructors cannot be inherited, even though a derived class can call the base class constructor. • Constructors cannot be virtual. • An object with a constructor cannot be used as a member of a union. • They make implicit calls to the operators new and delete when memory allocation is required.

6. Types of Constructors • There are mainly three types of constructors as follows: 1. Default Constructor 2. Parameterized Constructor 3. Copy Constructor

7. Default Constructor • Default constructor is the one which invokes by default when object of the class is created. • It is generally used to initialize the value of the data members. • It is also called no argument constructor.

8. Example class integar { int m,n; public: integer() // Default constructor { m=n=0; } };

9. Parameterized Constructor • Constructors that can take arguments are called parameterized constructors. • Sometimes it is necessary to initialize the various data elements of different objects with different values when they are created. • We can achieve this objective by passing arguments to the constructor function when the objects are created.

10. Example class integer { int m,n; public: integer(int x,int y) // Parameterized constructor { m =x; n=y; } };

11. Copy Constructor • A copy constructor is used to declare and initialize an object from another object. • For example, integer(integer &i); OR integer I2(I1); • Constructor which accepts a reference to its own class as a parameter is called copy constructor.

12. Example class integer { int m, n; public: integer(rectangle &x) // Copy constructor { m = x.m; n = x.n; } };

13. References

14. Thank You #include<iostream> using namespace std; int main() { cout << “Thank You”; return 0; }

Constructor and Types of Constructors

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