Oops Simple Example: Cash Register

cash_register.cpp

#include <iostream>
#include <iomanip>

using namespace std;
/*
    A simulated cash register that tracks item count and total amount due
*/
class CashRegister {
public:
    void clear();
    void add_item(double price);
    double get_total() const;
    int get_count() const;
    
private:
    int item_count;
    double total_price;
};

void CashRegister::clear() {
    item_count = 0;
    total_price = 0;
}

void CashRegister::add_item(double price) {
    item_count ++;
    total_price = total_price + price;
}

double CashRegister::get_total() const {
    return total_price;
}

int CashRegister::get_count() const {
    return item_count;
}

void display(CashRegister reg) { // not a member function
    cout << reg.get_count() << " $" << fixed << setprecision(2) << reg.get_total() << endl;
    
}

int main() {
    CashRegister c;
    c.clear();
    c.add_item(124.41);
    display(c);
    c.add_item(1234.23);
    display(c);
    c.add_item(232.23);
    display(c);
    return 0;
}