Implementing Copy Constructor

Question

I am attempting to add a copy constructor to each in order to run the main function. What I have implemented right now currenrtly prints out "b2.valuea = -858993460 b2.valueb = 10" So it reads valueb correctly but obviously something is going wrong with valuea. Advice?

#include "stdafx.h" #include <iostream> using namespace std; class A { int valuea; public: int getValuea() const { return valuea; } void setValuea(int x) { valuea = x; } // copy constructor A() {} A(const A& original) { valuea = original.valuea; } }; class B : public A { int valueb; public: int getValueb() const { return valueb; } void setValueb(int x) { valueb = x; } // copy constructor B(){} B(const B& original) { valueb = original.valueb; } }; int main() { B b1; b1.setValuea(5); b1.setValueb(10); B b2(b1); cout << "b2.valuea = " << b2.getValuea() << "b2.valueb = " << b2.getValueb() << endl; }

Constantin · Accepted Answer · 2015-10-22 02:50:43Z

You are not calling the copy constructor of your base-class in your derived copy constructor. Change it like:

B(const B& original) : A(original){ valueb = original.valueb; }

And it will output

b2.valuea = 5 b2.valueb = 10

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