Parameterized Constructor

Types Of Constructors:

1. Default Constructor
2. Parameterized Constructor

1.Default Constructor:

• Default Constructor invoke automatically when objects created.
• Default Constructor have no argument.
• Default Constructor follows all following ruels.
• Constructor should be declare in public section.
• Constructor are invoked automatically when object is created.
• Constructor do not have any datatype.
• Constructor cannot be inherited.
• Constructor have default argument like functions.
• Constructor cannot be virtual.

Syntax:
class codezword
{
.....................
.....................
.....................
codezword(); //default constructor
.....................
......................
};
coedzword :: codezword()
{
.....................
.....................
}

2. Parameterized Constructor:

• The constructors that can take arguments are called parameterized constructor.
• We must pass the initial values as arguments to the constructor function when an object is declared.
• We can pass the value by two ways

1. By calling the constructor explicitly.
2. By calling the constructor implicitly.

Example:

• explicit call

codezword int a = codezword(0,15);  //explicit call

• implicit call

codezword  int a(0,15);  // implicit  call

Syntax:

class codezword
{
.....................
.....................
int c,d;
.....................
public:
codezword(int a , int b);  //perameterized constructor
.....................
......................
};
coedzword :: codezword(int a, int b)
{
.....................
c=a; d=b;
.....................
}

Code:    

#include <iostream>

Using namespace std;

Class construct

{

Public:

    Int a, b;

    Construct()

    {

        A = 10;

        B = 20;

    }

};

Int main()

{

    Cout << “W.A.P. that illustrates the concept of constructor.\n\n\n”;

    Construct c;

    Cout << “a: “ << c.a << endl

         << “b: “ << c.b;

    Return 0;

}

Output: