Constructors in C++

Aniket Chandrakant Dhole — Wed, 10 Mar 2021 17:54:35 +0000

A constructor in C++ is a method that is implicitly called when an object of a class is created.

The constructor has the same name as the class, it is always public, and it does not have any return value.

When memory is allocated for object after that constructor is called.

Example
class Hello
{

public:

Hello()
{ // Constructor
cout << "Hello";
}
};

int main()
{
Hello myObj;
return 0;
}

constructors can also be defined outside the class.

class Hello
{

public:

int x;
int y;

Hello(int x, int y);

};

Hello::Hello(int a,int b) {
x = a;
y = b;
}

int main()
{
Hello hobj(10,20);
return 0;
}

Constructors can be useful for setting initial values for attributes.

Forem: Aniket Chandrakant Dhole