Constructors with overloading and with default parameters

Question

Write a program to show that constructors follow the property of function overloading as well as default parameter. Also, show that in case of constructor also, default parameter may create problem in implementing function overloading.

Answer 1

#include <iostream>

class Point

{

private:

double x;

double y;

public:

Point(double X=0, double Y=0)

{

x = X;

y = Y;

}

Point(void)

{

x=y=0;

}

};

int main()

{

Point p1(3,5);

Point p2(4);

Point p3; // causes ambiguity error... Point(void) or Point with both default arguments

}