Explain syntax rules for writing constructor functions, C/C++ Programming

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Syntax rules for writing constructor functions

Its name must be similar as that of the class to which it belongs.
It is declared with no return type (not even void). However, it will implicitly return a temporary copy of the instance itself that is being formed.
It cannot be declared static (a function which does not belong to a particular example), cost( in which you cannot make changes).
It should have public or protected access within the class. Only in very rare circumstances the programmers declare it in private section.

e.g.

class boxclass

{

public :

boxclass ( int x1, int y1, int x2, int y2);

void disp(void);

private :

int x1, y1;

int x2, y2 ;

};

boxclass::boxclass(int ax1,int ay1, int ax2, int ay2)

{

x1 = ax1 ;

y1 = ay1 ;

x2 = ax2 ;

y2 = ay2 ;

}

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