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减少if语句的数量

作者：手机用户2402851335 | 2023-08-28 13:43

如何解决《减少if语句的数量》经验，为你挑选了1个好方法。

到目前为止我有以下程序:

using System;
namespace ParkingTicket
{
    class Program
    {
        static void Main()
        {
            int speed;
            int yrInSchool;
            double fine;
            char choice = ' ';
            do
            {
                Console.Clear();
                speed = GetSpeed();
                if (speed <= 15)
                    Console.WriteLine("No speeding fine to pay.");
                else
                {
                    yrInSchool = GetYrInSchool();
                    fine = CalculateFine(speed, yrInSchool);
                    DisplayFine(fine);
                }
                choice = GetUserChoice();
            } while (choice != 'Q' && choice != 'q');
        }
        static int GetSpeed()
        {
            int speed;
            string userInput;
            try
            {
                Console.Write("Please enter the speed you were traveling: ");
                userInput = Console.ReadLine();
                speed = Convert.ToInt32(userInput);
            }
            catch
            {
                Console.WriteLine("\a\n INVALID - PLEASE TRY AGAIN");
                Console.Write("Please press enter to continue....");
                userInput = Console.ReadLine();
                speed = GetSpeed();  // this is the recursion - calling myself

            }
            return speed;

            // code this method
        }
        static int GetYrInSchool()
        {
            string userEntry;
            int year;

            /*************************************************************
             *  modify this method to validate the year using a Try/Catch
             *************************************************************/
            Console.WriteLine("\nClassifications");
            Console.WriteLine("\tFreshman  (enter 1)");
            Console.WriteLine("\tSophomore (enter 2)");
            Console.WriteLine("\tJunior    (enter 3)");
            Console.WriteLine("\tSenior    (enter 4)");

            try
            {
                Console.Write("Enter choice: ");
                userEntry = Console.ReadLine();
                year = Convert.ToInt32(userEntry);
            }

            catch
            {
                Console.WriteLine("\a\n INVALID - PLEASE TRY AGAIN");
                Console.Write("Please press enter to continue....");
                userEntry = Console.ReadLine();
                year = GetYrInSchool();  // this is the recursion - calling myself
            }
            return year;
        }
        static double CalculateFine(int speed, int year)
        {
            const double COST_PER_5_OVER = 87.50;
            const int SPEED_LIMIT = 15;
            const double INITIAL_FEE = 75.00;
            double fine = 0;

            if (((year == 1) && (speed >= 15) || (speed <= 19)))
            {
                fine = INITIAL_FEE - 50.00;
            }
            else if (((year == 1) && (speed >= 20) || (speed >= 24)))
            {
                fine += (INITIAL_FEE - 50.00) + COST_PER_5_OVER;
            }
            else if (((year == 1) && (speed >= 25) || (speed <= 29)))
            {
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 2);
            }
            else if (((year == 1) && (speed >= 30) || (speed <= 34)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 3);
            else if (((year == 1) && (speed >= 35) || (speed <= 39)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 4);
            else if (((year == 1) && (speed >= 40) || (speed <= 44)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 5);
            else if (((year == 1) && (speed >= 45) || (speed <= 49)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 6);
            if (((year == 1) && (speed >= 50) || (speed <= 54)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 7);
            if (((year == 1) && (speed >= 55) || (speed <= 59)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 8);
            if (((year == 1) && (speed >= 60) || (speed <= 64)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 9);
            if (((year == 1) && (speed >= 65) || (speed <= 69)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 10);
            if (((year == 1) && (speed >= 70) || (speed <= 74)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 11);
            if (((year == 1) && (speed >= 75) || (speed <= 79)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 12);
            if (((year == 1) && (speed >= 80) || (speed <= 84)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 13);
            if (((year == 1) && (speed >= 85) || (speed <= 89)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 14);
            if (((year == 1) && (speed >= 90) || (speed <= 94)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 15);
            if (((year == 1) && (speed >= 95) || (speed <= 99)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 16);
            if (((year == 1) && (speed >= 100) || (speed <= 104)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 17);
            if (((year == 1) && (speed >= 105) || (speed <= 109)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 18);
            if (((year == 1) && (speed >= 110) || (speed <= 114)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 19);
            if (((year == 1) && (speed >= 115) || (speed <= 119)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 20);
            if (((year == 1) && (speed >= 120) || (speed <= 124)))
                fine = (INITIAL_FEE - 50.00) + (COST_PER_5_OVER * 21);
            else if (((year == 2) && (speed >= 16) || (speed <= 19)))
                fine = INITIAL_FEE;
            if (((year == 2) && (speed >= 20) || (speed <= 24)))
                fine = INITIAL_FEE + (COST_PER_5_OVER);
            if (((year == 2) && (speed >= 25) || (speed <= 29)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 2);
            if (((year == 2) && (speed >= 30) || (speed <= 34)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 3);
            if (((year == 2) && (speed >= 35) || (speed <= 39)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 3);
            if (((year == 2) && (speed >= 40) || (speed <= 44)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 4);
            if (((year == 2) && (speed >= 45) || (speed <= 49)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 5);
            if (((year == 2) && (speed >= 50) || (speed <= 54)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 6);
            if (((year == 2) && (speed >= 55) || (speed <= 59)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 7);
            if (((year == 2) && (speed >= 60) || (speed <= 64)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 8);
            if (((year == 2) && (speed >= 65) || (speed <= 69)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 9);
            if (((year == 2) && (speed >= 70) || (speed <= 74)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 10);
            if (((year == 2) && (speed >= 75) || (speed <= 79)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 11);
            if (((year == 2) && (speed >= 80) || (speed <= 84)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 12);
            if (((year == 2) && (speed >= 85) || (speed <= 89)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 13);
            if (((year == 2) && (speed >= 90) || (speed <= 94)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 14);
            if (((year == 2) && (speed >= 95) || (speed <= 99)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 15);
            if (((year == 2) && (speed >= 100) || (speed <= 104)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 16);
            if (((year == 2) && (speed >= 105) || (speed <= 109)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 17);
            if (((year == 2) && (speed >= 110) || (speed <= 114)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 18);
            if (((year == 2) && (speed >= 115) || (speed <= 119)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 19);
            if (((year == 2) && (speed >= 120) || (speed <= 124)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 20);
            if (((year == 2) && (speed >= 125) || (speed <= 129)))
                fine = INITIAL_FEE + (COST_PER_5_OVER * 21);
            else if (((year == 3) && (speed >= 16) || (speed <= 19)))
                fine = INITIAL_FEE + 50.00;
            if (((year == 3) && (speed >= 20) || (speed <= 24)))
                fine = INITIAL_FEE + 50.00 + (COST_PER_5_OVER);
            if (((year == 3) && (speed >= 25) || (speed <= 29)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 2);
            if (((year == 3) && (speed >= 30) || (speed <= 34)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 3);
            if (((year == 3) && (speed >= 35) || (speed <= 39)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 4);
            if (((year == 3) && (speed >= 40) || (speed <= 44)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 5);
            if (((year == 3) && (speed >= 45) || (speed <= 49)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 6);
            if (((year == 3) && (speed >= 50) || (speed <= 54)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 7);
            if (((year == 3) && (speed >= 55) || (speed <= 59)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 8);
            if (((year == 3) && (speed >= 60) || (speed <= 64)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 9);
            if (((year == 3) && (speed >= 65) || (speed <= 69)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 10);
            if (((year == 3) && (speed >= 70) || (speed <= 74)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 11);
            if (((year == 3) && (speed >= 75) || (speed <= 79)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 12);
            if (((year == 3) && (speed >= 80) || (speed <= 84)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 13);
            if (((year == 3) && (speed >= 85) || (speed <= 89)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 14);
            if (((year == 3) && (speed >= 90) || (speed <= 94)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 15);
            if (((year == 3) && (speed >= 95) || (speed <= 99)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 16);
            if (((year == 3) && (speed >= 100) || (speed <= 104)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 17);
            if (((year == 3) && (speed >= 105) || (speed <= 109)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 18);
            if (((year == 3) && (speed >= 110) || (speed <= 114)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 19);
            if (((year == 3) && (speed >= 115) || (speed <= 119)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 20);
            if (((year == 3) && (speed >= 120) || (speed <= 124)))
                fine = (INITIAL_FEE + 50.00) + (COST_PER_5_OVER * 21);
            else if (((year == 4) && (speed >= 16) || (speed <= 19)))
                fine = INITIAL_FEE + 100.00;
            if (((year == 4) && (speed >= 20) || (speed <= 24)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER);
            if (((year == 4) && (speed >= 25) || (speed <= 29)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 2);
            if (((year == 4) && (speed >= 30) || (speed <= 34)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 3);
            if (((year == 4) && (speed >= 35) || (speed <= 39)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 4);
            if (((year == 4) && (speed >= 40) || (speed <= 44)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 5);
            if (((year == 4) && (speed >= 45) || (speed <= 49)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 6);
            if (((year == 4) && (speed >= 100) || (speed <= 54)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 7);
            if (((year == 4) && (speed >= 55) || (speed <= 59)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 8);
            if (((year == 4) && (speed >= 60) || (speed <= 64)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 9);
            if (((year == 4) && (speed >= 65) || (speed <= 69)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 10);
            if (((year == 4) && (speed >= 70) || (speed <= 74)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 11);
            if (((year == 4) && (speed >= 75) || (speed <= 79)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 12);
            if (((year == 4) && (speed >= 80) || (speed <= 84)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 13);
            if (((year == 4) && (speed >= 85) || (speed <= 89)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 14);
            if (((year == 4) && (speed >= 90) || (speed <= 94)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 15);
            if (((year == 4) && (speed >= 95) || (speed <= 99)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 16);
            if (((year == 4) && (speed >= 100) || (speed <= 104)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER);
            if (((year == 4) && (speed >= 105) || (speed <= 109)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 18);
            if (((year == 4) && (speed >= 110) || (speed <= 114)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 19);
            if (((year == 4) && (speed >= 115) || (speed <= 119)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 20);
            if (((year == 4) && (speed >= 120) || (speed <= 124)))
                fine = (INITIAL_FEE + 100.00) + (COST_PER_5_OVER * 21);

            // finish coding this method

            return fine;
        }

        static void DisplayFine(double fine)
        {
            Console.WriteLine("Fine: {0:C}", fine);
        }

        static char GetUserChoice()
        {
            Console.Write
                ("\nPress \"C\" to [C]ontinue or \"Q\" to [Q]uit: ");
            string userEntry = Console.ReadLine();
            char choice = Convert.ToChar(userEntry);
            Console.WriteLine("------------------------------------");
            return choice;
        }
    }
}

我有一个完整的列表,这些声明高达125英里/小时和不同年份:1到4.我正在尝试制作一个程序,接受车辆的速度输入,然后根据速度提供适当的票务信息.

限速为15英里/小时.每超过5英里的速度限制,总计增加87.50美元.2年级是大二学生,因此需要50.00美元的折扣.然而,就像第4年一样,总额增加了100.00美元的费用.我为每个速度得到相同的总数.为什么？

1> E.M...：

其他人对运营商优先权的看法似乎是正确的,但我认为这里有一个更大的问题.你真的不需要数以万计的if语句来模拟这个问题.我相信你现在已经发现这种方法不可维护.试图改变那堆ifs中的任何东西将是一个真正的痛苦,非常容易出错.

我要做的第一件事是将折扣的计算与罚款的计算分开.这样您就不必手动计算折扣和罚款的每种可能组合.这就是我在说的:

static double CalculateFine(int speed, int year)
{
    const double COST_PER_5_OVER = 87.5;
    const int SPEED_LIMIT = 15;
    const double INITIAL_FEE = 75;

    // Should there be a fine at all?
    if (speed > SPEED_LIMIT) {
        // The discount is 50 for each year, scaled so that year 1 is
        // -50, year 2 is 0, and so on.
        double discount = year * 50 - 100;

        // Now calculate the standard fee.
        int feeMultiplier = (speed - SPEED_LIMIT) / 5;
        double fine = feeMultiplier * COST_PER_5_OVER + INITIAL_FEE;

        return discount + fine;
    }
    return 0.;
}

最后,折扣和罚款仅合并一次.真的,这只是弄清楚用什么公式来计算罚款,然后实施.如果以更随意的方式定义罚款,那么表格可能是有用的.

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