Runtime Polymorphism

#include<iostream>
#include<cstring>
#include<iomanip>
using namespace std;

class tutorial {
	protected:
		char language[30];
		float price;

	public:
		tutorial(char *lng, float prc) {

			/* Copy string */
			strcpy(language, lng);
			price = prc;
		}
	
		/* Empty virtual function */
		virtual void display() { }		
};

class code : public tutorial {
	int lines;

	public:
		code(char *lngue, int ln, float price) : tutorial(lngue, price) {
			lines = ln;
		}

		void display() {
			cout << "\n<------------Code------------>\n" << endl;
			cout << "Language: " << language << endl;
			cout << "Lines of Code: " << lines << endl;

			/* 'setprecision(2)' and 'fixed' use to print fixed two decimal point */
			cout << "Price: " << setprecision(2) << fixed << price << endl;
		}
	
};

class video : public tutorial {
	float runtime;

	public:
		video(char *lngue, float time, float price) : tutorial(lngue, price) {
			runtime = time;
		}
	
		void display() {
			cout << "\n<------------Video------------>\n" << endl;
			cout << "Language: " << language << endl;
			cout << "Runtime: " << setprecision(2) << fixed << runtime << endl;
			cout << "Price: " << setprecision(2) << fixed << price << endl;
		}
};

int main() {
	char *langu = new char[30];
	float price, time;
	int lines;

	/* Code tutorial */
	cout << "\nEnter code tutorial details" << endl;
	cout << "Language: " << endl;
	cin >> langu;
	cout << "Lines of code:" << endl;
	cin >> lines;
	cout << "Price:" << endl;
	cin >> price;

	code cd(langu, lines, price);

	/* Video tutorial */
	cout << "\nEnter video tutorial details" << endl;
	cout << "Language: " << endl;
	cin >> langu;
	cout << "Runtime:" << endl;
	cin >> time;
	cout << "Price:" << endl;
	cin >> price;

	video vd(langu, time, price);

	/* Object pointer */
	tutorial *list[2];
	list[0] = &cd;
	list[1] = &vd;

	cout << "\nTutorial Details" << endl;

	/* Display code tutorial details using member access operator */
	list[0]->display();

	/* Display video tutorial details using member access operator */
	list[1]->display();
	return 0;
}