Constructor creation

Question

I don't understand, a constructor is called when you create an object or when you declare one?

Answer 1

The constructor is the part of the object in which the initial data of this object is declared when it is created.

Answer 2

The constructor is called when you create an Object of that class..All its operations are executed right away..

Eg...
class sample{
sample(){
cout<<"Hello World";
}
}

//create object
sample object;
//outputs "hello world"

Answer 3

If you declare (write) a (non-static) class, nothing is called there. This is a passive definition archived for future use.

If you create an object using a class as a rule, by assigning it to the variable, the new object will be initialized with the constructor if the class has it.