01. Computer Store

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

int main() {
    string command;
    cin >> command;

    double totalPrice = 0, price;

    while (command != "special" && command != "regular") {
        price = stod(command);
        if (price > 0) {
            totalPrice += price;
        }
        else {
            cout << "Invalid price!\n";
        }
        cin >> command;
    }

    if (totalPrice == 0) {
        cout << "Invalid order!\'n";
    }
    else {
        cout << fixed << setprecision(2) <<
            "Congratulations you've just bought a new computer!\n" <<
            "Price without taxes: " << totalPrice << "$\n" <<
            "Taxes: " << totalPrice / 5 << "$\n" <<
            "-----------\n" <<
            "Total price: " << totalPrice * 1.2 * (command == "special" ? 0.9 : 1) << "$\n";
    }
    return 0;
}