​C++ Constructors Explained: Default and Parameterized Constructor

CODE:

#include<iostream>

using namespace std;

class Animal

{ 

public:

Animal()

{ 

cout<<"Animal Constructor called"<<endl;

}

};

class Human

{ 

public:

Human(string s)

{ 

cout<<"Human Constructor called : "<<s<<endl;

}

};

int main()

{

Animal A;

Human H("Wow");

return 0;

}

Explanation :

​What is a Constructor? Constructor ka naam bilkul class ke naam jaisa hota hai aur iski koi return type (jaise int ya void) nahi hoti.

​Default Constructor: Animal class mein koi value pass nahi karni parti. Jaise hi Animal A; likha, constructor chal gaya.

​Parameterized Constructor: Human class mein humne aik string pass ki hai. Iska matlab hai ke object banate waqt hume value dena lazmi hai, jaise Human H("Wow");.

​Automatic Execution: Humein in functions ko A.Animal() karke call nahi karna parta, ye khud hi execute ho jate hain.

​Output:

​Animal Constructor called

Human Constructor called : Wow