c# - 如何在 Switch 语句中使用 C# 枚举,同时保持其余代码相同
问题描述
我正在制作一个 C# 数学项目,用户根据他们选择的难度级别回答加法、减法、乘法、除法、幂或平方根问题!
我刚刚开始使用 Enums,但我不知道如何将它放在我的 switch 语句中,所以我的其余代码工作正常。
到目前为止,这是我的代码:
using System;
namespace mathstester
{
class Program
{
public enum UserDifficulty
{
Easy,
Normal,
Hard
}
public enum MathOperation
{
Addition = 1,
Subtraction = 2,
Multiplication = 3,
Division = 4,
Power = 5,
SquareRoot = 6
}
public static (int operationMin, int operationMax) GetMathOperationForDifferentDifficulties(UserDifficulty userDifficulty)
{
switch (userDifficulty)
{
case UserDifficulty.Easy:
return (1, 4);
case UserDifficulty.Normal:
return (1, 5);
case UserDifficulty.Hard:
return (3, 7);
default:
throw new Exception();
}
}
public static (string message, double correctAnswer) GetMathsEquation(MathOperation mathOperation, UserDifficulty userDifficulty)
{
int number1;
int number2;
Random random = new Random();
switch (mathOperation)
{
case MathOperation.Addition:
number1 = random.Next(1000);
number2 = random.Next(1000);
return ($"{number1} + {number2}", number1 + number2);
case MathOperation.Subtraction:
number1 = random.Next(1000);
number2 = random.Next(1000);
return ($"{number1} - {number2}", number1 - number2);
case MathOperation.Multiplication:
number1 = userDifficulty == UserDifficulty.Easy ? random.Next(13) : random.Next(1000);
number2 = userDifficulty == UserDifficulty.Easy ? random.Next(13) : random.Next(1000);
return ($"{number1} * {number2}", number1 * number2);
case MathOperation.Division:
number1 = random.Next(10000);
number2 = random.Next(1000);
return ($"{number1} / {number2}", number1 / (double)number2);
case MathOperation.Power:
number1 = random.Next(13);
number2 = random.Next(5);
return ($"{number1} ^ {number2}", Math.Pow(number1, number2));
case MathOperation.SquareRoot:
number1 = random.Next(1000);
return ($"√{number1}", Math.Sqrt(number1));
default:
throw new Exception();
}
}
public static int GetResult(int numberOfQuestionsLeft, string userDifficulty)
{
int score = 0;
Random random = new Random();
var (operationMin, operationMax) = GetMathOperationForDifferentDifficulties(userDifficulty);
while (numberOfQuestionsLeft > 0)
{
int mathOperation = random.Next(operationMin, operationMax);
var (message, correctAnswer) = GetMathsEquation(mathOperation, userDifficulty);
if (mathOperation == 4 || mathOperation == 6)
{
Console.Write($"To the nearest integer, What is {message} =");
}
else
{
Console.Write($"What is {message} =");
}
double userAnswer = Convert.ToDouble(Console.ReadLine());
if (Math.Round(correctAnswer) == userAnswer)
{
Console.WriteLine("Well Done!");
score++;
}
else
{
Console.WriteLine("Your answer is incorrect!");
}
numberOfQuestionsLeft--;
}
return score;
}
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.WriteLine("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 score = GetResult(numberOfQuestions, userDifficulty);
Console.WriteLine($"You got a score of {score} out of {numberOfQuestions}");
}
}
}
解决方案
您的问题似乎在于选择困难-在您的Main()
方法中,您输入E
,N
或H
困难,然后将其传递给GetResult()
并继续传递给GetMathOperationForDifferentDifficulties()
但是,由于枚举是由 C# 中的数字类型支持的,因此这将失败并引发异常。
要修复它,您需要将, E
, or分别转换为, N
, or ,然后以这种方式传递它们。H
UserDifficulty.Easy
UserDifficulty.Normal
UserDifficulty.Hard
以下是您可以修改Main()
以执行此操作的方法:
public static void Main(string[] args)
{
string difficultyInput = "";
UserDifficulty userDifficulty = UserDifficulty.Easy // default to start
do
{
Console.WriteLine("What difficulty level would you like to do! Please type E for Easy, N for Normal and H for hard");
difficultyInput = Console.ReadLine().ToUpper();
} while (difficultyInput != "E" && difficultyInput != "N" && difficultyInput != "H");
switch(difficultyInput) {
case "E":
userDifficulty = UserDifficulty.Easy;
break;
case "N":
userDifficulty = UserDifficulty.Normal;
break;
case "H":
userDifficulty = UserDifficulty.Hard;
break;
}
int numberOfQuestions = 0;
do
{
Console.WriteLine("How many questions would you like to answer? Please type a number divisible by 10!");
int.TryParse(Console.ReadLine(), out numberOfQuestions);
} while (numberOfQuestions % 10 != 0);
int score = GetResult(numberOfQuestions, userDifficulty);
Console.WriteLine($"You got a score of {score} out of {numberOfQuestions}");
}
请记住,您也需要更改以GetResult()
获取UserDifficulty
输入而不是 astring
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