08. Fuel Tank - Part 2

#include <iostream>
#include <string>

using namespace std;

int main() {
    const double GAS_PRICE = 0.93;
    const double DIESEL_PRICE = 2.33;
    const double GASOLINE_PRICE = 2.22;

    string fuel;
    cin >> fuel;

    double liters;
    cin >> liters;

    string card;
    cin >> card;

    double cardDiscount = card == "Yes" ? (fuel == "Gasoline" ? 0.18 : fuel == "Diesel" ? 0.12 : 0.08) : 0;
    double quantitativeDiscount = liters > 25 ? 0.10 : liters >= 20 ? 0.08 : 0;

    double totalSum = (((fuel == "Gas" ? GAS_PRICE : fuel == "Diesel" ? DIESEL_PRICE : GASOLINE_PRICE) - cardDiscount) * liters) * (1 - quantitativeDiscount);

    cout.setf(ios::fixed);
    cout.precision(2);

    cout << totalSum << " lv." << endl;

    return 0;
}