Question

How to use pure virtual functions as a prototype in C++

Answer 1

#include <iostream>

using std::cout;
using std::endl;

class number {
protected:
	int value;
public:
	void set(int _value) { value = _value; }
	virtual void show() = 0; // pure virtual function
};

class hexClass : public number {
public:
	void show() {
		cout << std::hex << value << endl;;
	}
};


class octClass : public number {
public:
	void show() {
		cout << std::oct << value << endl;
	}
};

int main()
{
	hexClass h;
	octClass o;

	h.set(131);
	h.show(); 

	o.set(180);
	o.show();  

	return 0;
}


/*
run:

83
264

*/

 

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