我的C#数学项目找不到我的错误

问题描述 投票:-1回答:2

我正在做一个数学项目,在该项目中,我会根据用户选择的难度级别向用户询问一些问题!

为了简单起见,我问加,减和乘的问题。对于正常水平,我会问加,减,乘和除的问题。对于硬性水平,我会问乘法,除法,幂和平方根问题。

当用户选择容易和困难的难度级别时,它工作正常,但是当用户选择正常难度时,它只给出附加问题。

这是我的代码:

using System;

namespace mathstester
{
    class Program
    {
        enum UserDifficulty
        {
            Easy,
            Normal,
            Hard
        }
        public static void Main(string[] args)
        {
            string userDifficulty = "";
            do
            {
                Console.WriteLine("What difficulty level would you like to do! Please type E for Easy, N for Normal and H for hard");
                userDifficulty = Console.ReadLine().ToUpper();
            } while (userDifficulty != "E" && userDifficulty != "N" && userDifficulty != "H");

            int numberOfQuestions = 0;
            do
            {
                Console.Write("How many questions would you like to answer? Please type a number divisible by 10!");
                int.TryParse(Console.ReadLine(), out numberOfQuestions);
            } while (numberOfQuestions % 10 != 0);

            int numberOfQuestionsLeft = numberOfQuestions;
            Random random = new Random();
            int score = 0;

            while (numberOfQuestionsLeft > 0)
            {
                var operation = random.Next(1, 7);
                int number1 = 0;
                int number2 = 0;
                switch (userDifficulty)
                {
                    case "E":
                        switch (operation)
                        {
                            case 1:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;
                            case 2:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;
                            case 3:
                                number1 = random.Next(13);
                                number2 = random.Next(13);
                                break;

                        }
                        break;
                    case "N":
                        switch (operation)
                        {
                            case 1:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;
                            case 2:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;
                            case 3:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;
                            case 4:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;

                        }
                        break;
                    case "H":
                        switch (operation)
                        {
                            case 3:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;
                            case 4:
                                number1 = random.Next(1000);
                                number2 = random.Next(1000);
                                break;
                            case 5:
                                number1 = random.Next(13);
                                number2 = random.Next(4);
                                break;
                            case 6:
                                number1 = random.Next(100);
                                break;

                        }
                        break;
                }

                if(operation == 1 && userDifficulty == "E" || userDifficulty == "N")
                {
                    Console.Write($"What is {number1} + {number2} =");
                    int correctAnswer = number1 + number2;
                    int userAnswer = Convert.ToInt32(Console.ReadLine());
                    if (correctAnswer == userAnswer)
                    {
                        Console.WriteLine("Well Done!");
                        score++;
                    }
                    else
                    {
                        Console.WriteLine("Your answer is incorrect!");
                    }
                    numberOfQuestionsLeft--;
                }
                else if (operation == 2 && (userDifficulty == "E" || userDifficulty == "N"))
                {
                    Console.Write($"What is {number1} - {number2} =");
                    int correctAnswer = number1 - number2;
                    int userAnswer = Convert.ToInt32(Console.ReadLine());
                    if (correctAnswer == userAnswer)
                    {
                        Console.WriteLine("Well Done!");
                        score++;
                    }
                    else
                    {
                        Console.WriteLine("Your answer is incorrect!");
                    }
                    numberOfQuestionsLeft--;
                }
                else if (operation == 3 && (userDifficulty == "E" || userDifficulty == "N" || userDifficulty == "H"))
                {
                    Console.Write($"What is {number1} * {number2} =");
                    int correctAnswer = number1 * number2;
                    int userAnswer = Convert.ToInt32(Console.ReadLine());
                    if (correctAnswer == userAnswer)
                    {
                        Console.WriteLine("Well Done!");
                        score++;
                    }
                    else
                    {
                        Console.WriteLine("Your answer is incorrect!");
                    }
                    numberOfQuestionsLeft--;
                }
                else if (operation == 4 && (userDifficulty == "N" || userDifficulty == "H"))
                {
                    Console.Write($"What is {number1} / {number2} =");
                    int correctAnswer = number1 / number2;
                    int userAnswer = Convert.ToInt32(Console.ReadLine());
                    if (correctAnswer == userAnswer)
                    {
                        Console.WriteLine("Well Done!");
                        score++;
                    }
                    else
                    {
                        Console.WriteLine("Your answer is incorrect!");
                    }
                    numberOfQuestionsLeft--;
                }
                else if (operation == 5 && userDifficulty == "H")
                {
                    Console.Write($"What is {number1} ^ {number2} =");
                    double correctAnswer = Math.Pow(number1, number2);
                    int userAnswer = Convert.ToInt32(Console.ReadLine());
                    if (correctAnswer == userAnswer)
                    {
                        Console.WriteLine("Well Done!");
                        score++;
                    }
                    else
                    {
                        Console.WriteLine("Your answer is incorrect!");
                    }
                    numberOfQuestionsLeft--;
                }
                else if (operation == 6 && userDifficulty == "H")
                {
                    Console.Write($"What is √{number1} =");
                    double correctAnswer = Math.Sqrt(number1);
                    int userAnswer = Convert.ToInt32(Console.ReadLine());
                    if (correctAnswer == userAnswer)
                    {
                        Console.WriteLine("Well Done!");
                        score++;
                    }
                    else
                    {
                        Console.WriteLine("Your answer is incorrect!");
                    }
                    numberOfQuestionsLeft--;
                }
            }
            Console.WriteLine($"You got a score of {score} out of {numberOfQuestions}");
        }
    }
}

[当我选择普通难度时:enter image description here

有人可以帮助我发现我的错误吗?

谢谢!

c# math
2个回答
4
投票

您的问题在这一行:

if (operation == 1 && userDifficulty == "E" || userDifficulty == "N")

&&优先于||。这意味着它将先检查operation == 1userDifficulty == "E",然后再单独检查userDifficulty == "N"。由于对于您的通常难度而言,最后一个条件总是正确的,因此它将始终选择该条件(因为它是代码中的第一个选项)。

要修复它,请添加括号。

if (operation == 1 && (userDifficulty == "E" || userDifficulty == "N"))

0
投票

根据您的条件,请勿使用|| (或)受条件限制,因为它还读取了其他条件,使用了“ if(operation == 1 && user Difficulty ==“ E”)“,而不是XX if(operation == 1 && user Difficulty ==” E“ ||用户难度==“ N”)XX。

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