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


int main()
{
    string day;
    int startTime, minutes;
    double cost, rate; 
    char ch ;

    cout << fixed << showpoint << setprecision(2);

    do {
        cout << "Enter start time of the call(For example, 2:30 = 2330):  " << endl;
        cin >> startTime;

        while (startTime<0 || startTime>2400) {

            cout << "\nInvalid time.";          // keep asking for time input until it is valid
            cout << "Enter start time of the call(For example, 2:30 = 2330): ";
            cin >> startTime;
        }

        cout << "Enter length of the call in minutes: ";
        cin >> minutes;
        cout << "Enter the day of the week: ";
        cin >> day;

        if (day == "monday" || day == "MONDAY" || day == "tuesday" || day == "TUESDAY" || day == "wednesday" || day == "WEDNESDAY"
            || day == "THURSDAY" || day == "thursday" || day == "friday" || day == "FRIDAY") {

            if (startTime >= 800 && startTime <= 1800)
                rate = 0.4;
            else
                rate = 0.25;
            cost = minutes * rate;

            cout << "\nRate for the call was " << "$" << rate << " a minute" << endl
                 << "Your total cost: " << "$" << cost << endl;
        }

        else if (day == "saturday" || day == "SATURDAY" || day == "sunday" || day == "SUNDAY")
        {
            rate = 0.15;
            cost = minutes * rate;
            cout << "\Rate for the call was " << "$" << rate << " a minute" << endl
                 << "Your total cost: " << "$" << cost;

        }

        else
            cout << "\nInvalid.";

        cout << "\nWould you like to calculate  your bill again ? (y / n) : ";
        cin >> ch;
        cout << endl;
        
        

    }


    while (ch == 'Y' || ch == 'y');
    cout << "End of programm" <<endl;

    return 0;
}