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//start//
#include <iostream>
#include <string>
 
using namespace std;
 
class IPay
{
private:
 
public:
 
	virtual void input_money(int a) = 0;
 
	virtual void print_receipt() = 0;
 
};
 
class CashPay //: public IPay
{
private:
 
	int money_recieved;
 
public:
 
	CashPay() {};
 
	void input_money(int a) //override
	{
		this->money_recieved = a;
 
	}
 
	void print_receipt() //override
	{
		cout << "You paid " << this->money_recieved << " bucks in cash!" << endl;
	}
};
 
class CardPay //: public IPay
{
private:
 
	int money_recieved;
 
public:
 
	CardPay() {};
 
	void input_money(int a) //override
	{
		this->money_recieved = a;
	}
 
	void print_receipt() //override
	{
		cout << "\nProcessing...\n" << endl;
		cout << "You paid " << this->money_recieved << " bucks by card!" << endl;
	}
};
 
// context object
class PaymentPoint
{
private:
	IPay * payment_method;
 
public:
 
	PaymentPoint() {};
 
	void set_payment_method(IPay *payment_method)
	{
		this->payment_method = payment_method;
	}
 
	void pay(int a)
	{
		payment_method->input_money(a);
 
		payment_method->print_receipt();
	}
};
 
 
int main()
{
	PaymentPoint payment_point;
	CashPay *cash_pay = new CashPay();
	CardPay card_pay();
 
	CardPay *card_pay1 = new CardPay();
 
	string payment_method;
	cout << "Enter payment method: ";
	cin >> payment_method;
 
	if (payment_method == "cash")
	{
		payment_point.set_payment_method(cash_pay);
		payment_point.pay(150);
	}
	else if (payment_method == "card")
	{
		payment_point.set_payment_method(card_pay1);
		payment_point.pay(1337);
	}
 
	system("pause");
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:101:44: error: no matching function for call to ‘PaymentPoint::set_payment_method(CashPay*&)’
   payment_point.set_payment_method(cash_pay);
                                            ^
prog.cpp:73:7: note: candidate: ‘void PaymentPoint::set_payment_method(IPay*)’
  void set_payment_method(IPay *payment_method)
       ^~~~~~~~~~~~~~~~~~
prog.cpp:73:7: note:   no known conversion for argument 1 from ‘CashPay*’ to ‘IPay*’
prog.cpp:106:45: error: no matching function for call to ‘PaymentPoint::set_payment_method(CardPay*&)’
   payment_point.set_payment_method(card_pay1);
                                             ^
prog.cpp:73:7: note: candidate: ‘void PaymentPoint::set_payment_method(IPay*)’
  void set_payment_method(IPay *payment_method)
       ^~~~~~~~~~~~~~~~~~
prog.cpp:73:7: note:   no known conversion for argument 1 from ‘CardPay*’ to ‘IPay*’
prog.cpp:110:8: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
  system("pause");
  ~~~~~~^~~~~~~~~

Standard output is empty