4.07.FruitShopContainsKey

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class FruitShop
{
    static void Main()
    {
        string fruit = Console.ReadLine();
        string dayOfWeek = Console.ReadLine();
        double quantity = double.Parse(Console.ReadLine());
        double price;
        var daysOfWeek = new List<string> { "Monday", "Tuesday", "Wednesday", "Thirsday", "Friday" };
        var daysOfWeekend = new List<string> { "Saturday", "Sunday" };

        Dictionary<string, double> pricesWeek = new Dictionary<string, double>
        { { "banana", 2.50 }, { "apple", 1.20}, { "orange", 0.85},
            {"grapefruit", 1.45}, {"kiwi", 2.70}, { "pineapple", 5.50}, { "grapes", 3.85}
        };
        Dictionary<string, double> pricesWeekend = new Dictionary<string, double>
        { { "banana", 2.70 }, { "apple", 1.25}, { "orange", 0.90},
            {"grapefruit", 1.60}, {"kiwi", 3.00}, { "pineapple", 5.60}, { "grapes", 4.20}
        };

        if ((daysOfWeek.Contains(dayOfWeek)) && (pricesWeek.ContainsKey(fruit)))
        {
            price = quantity * pricesWeek[fruit];
            Console.WriteLine("{0:f2}", price);
        }
        else if ((daysOfWeekend.Contains(dayOfWeek)) && (pricesWeekend.ContainsKey(fruit)))
        {
            price = quantity * pricesWeekend[fruit];
            Console.WriteLine("{0:f2}", price);
        }
        else
        {
            Console.WriteLine("error");
        }
    }
}