Define two methods of constructor invocation? | Constructor in C++

The following are the two ways to invoke a constructor:
1. The compiler embeds a call to the constructor for each object that has got created. For example:

class A

{

int x;

public: void setx(const int=0);

int getx();

};

main()

{

A A1; //object declared constructor called.

A1.A(); //constructor called implicity.

}

2. The constructor is called for each object that is created dynamically in the heap by the new operator. For example:

A *Aptr

A*ptr=new A; //constructor called implicity by compiler.