The default constructor is used when an object is created without a value and hence the object will have to be initialized with a default value. The point declared previously could be implemented like this:
class point { double x; double y; public: point() { x = 0; y = 0; } };
This explicitly initializes the items to a value of zero. If you want to create an instance with the default values, you do not include parentheses.
point p; // default constructor called
It is important to be aware of this syntax because it is easy to write the following by mistake:
point p(); // compiles, but is a function prototype!
This will compile because the compiler will think you are providing a function prototype as a forward ...
