Question

How to convert liters to gallons using virtual function in C++

Answer 1

#include <iostream>

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

class convert {
protected:
	double value;  
public:
	convert(double _value) { value = _value; }
	double get_value() { return value; }
	virtual double calc() = 0;
};

class liters_to_gallons : public convert {
public:
	liters_to_gallons(double _value) : convert(_value) { }
	double calc() { return value * 0.26417205235815; }
};


int main()
{
	convert *p;  
	liters_to_gallons ltog(5);

	p = &ltog;
	
	cout << p->get_value() << " liters = " << p->calc() << " gallons" << endl;

	return 0;
}

/*
run:

5 liters = 1.32086 gallons

*/

 

70+ SQL courses for beginners and professionals