Question

How to convert fahrenheit to celsius 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 fahrenheit_to_celsius : public convert {
public:
	fahrenheit_to_celsius(double i) : convert(i) { }
	double calc() {	return (value - 32) / 1.8; 	}
};


int main()
{
	convert *p;  
	fahrenheit_to_celsius ftoc(75);

	p = &ftoc;
	
	cout << p->get_value() << " fahrenheit = " << p->calc() << " celsius" << endl;

	return 0;
}

/*
run:

75 fahrenheit = 23.8889 celsius

*/

 

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