我知道如果我只使用连续的数字会更容易，但我想让用户更容易选择与他们选择的模具类型相对应的数字。如果我使用or运算符，我是否仅限于比较两件事？这是我想做的，但没有成功。我的语法有错吗？或者我不能在一个语句中字符串显示多个术语吗？：
if (typeOfDice != 4 || typeOfDice != 6 ||
typeOfDice != 8 || typeOfDice != //10 || typeOfDice != 12 ||
typeOfDice != 20 || typeOfDice != 100)
这是我试图让它工作的短程序。我只想确保用户不会破坏程序：
static void Main(string[] args)
{
Start:
Random roll = new Random();
// Request dice type from user
Console.WriteLine("Please input the type of dice you want to roll. ");
// Display dice types to user
Console.WriteLine("4) Four-sided");
Console.WriteLine("6) Six-sided");
Console.WriteLine("8) Eight-sided");
Console.WriteLine("10) Ten-sided");
Console.WriteLine("12) Twelve-sided");
Console.WriteLine("20) Twenty-sided");
Console.WriteLine("100) Percentage");
Console.WriteLine(" ");
// Take dice type from user
Console.Write("Type of Dice: ");
int typeOfDice = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(" ");
// Prevents user from breaking the program by printing a corrective message
// and restarting the program in the event an inappropriate choice is made by the user.
if (typeOfDice != 4 || typeOfDice != 6 ||
typeOfDice != 8 || typeOfDice != //10 || typeOfDice != 12 ||
typeOfDice != 20 || typeOfDice != 100)
Console.WriteLine("That is not an acceptable die type. Please try again.");
goto Start;
else
{
// Initiates random variable and total variable
Random rnd = new Random();
int total = 0;
// Request number of dice from user
Console.WriteLine("Please input the number of dice you want to roll ");
Console.WriteLine(" ");
// Accept number of dice from user
Console.Write("Number of Dice: ");
int numberOfDice = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(" ");
/// Assigns random generator parameters to user's choice of dice type and
// generates random number, looping until the die is rolled the requested
// number of times and the result of each new roll is added to the total
switch (typeOfDice)
{
case 4:
for (int count = 0; count < numberOfDice; count++)
{
int currentRoll = rnd.Next(typeOfDice);
total += currentRoll + 1;
Console.Write("{0} ", currentRoll + 1);
//Console.WriteLine(" ");
}
break;
case 6:
for (int count = 0; count < numberOfDice; count++)
{
int currentRoll = rnd.Next(typeOfDice);
total += currentRoll + 1;
Console.Write("{0} ", currentRoll + 1);
//Console.WriteLine(" ");
}
break;
case 8:
for (int count = 0; count < numberOfDice; count++)
{
int currentRoll = rnd.Next(typeOfDice);
total += currentRoll + 1;
Console.Write("{0} ", currentRoll + 1);
//Console.WriteLine(" ");
}
break;
case 10:
for (int count = 0; count < numberOfDice; count++)
{
int currentRoll = rnd.Next(typeOfDice);
total += currentRoll + 1;
Console.Write("{0} ", currentRoll + 1);
//Console.WriteLine(" ");
}
break;
case 12:
for (int count = 0; count < numberOfDice; count++)
{
int currentRoll = rnd.Next(typeOfDice);
total += currentRoll + 1;
Console.Write("{0} ", currentRoll + 1);
//Console.WriteLine(" ");
}
break;
case 20:
for (int count = 0; count < numberOfDice; count++)
{
int currentRoll = rnd.Next(typeOfDice);
total += currentRoll + 1;
Console.Write("{0} ", currentRoll + 1);
// Console.WriteLine(" ");
}
break;
case 100:
for (int count = 0; count < numberOfDice; count++)
{
int currentRoll = rnd.Next(typeOfDice);
total += currentRoll + 1;
Console.Write("{0} ", currentRoll + 1);
//Console.WriteLine(" ");
}
break;
}
// Prints total of dice rolls.
Console.WriteLine(" ");
Console.WriteLine("Total: {0}", total);
Console.WriteLine(" ");
goto Start;
}
}
您想要一个&；（逻辑与）在您的测试之间，而不是||（逻辑或）
if (typeOfDice != 4 &&
typeOfDice != 6 &&
typeOfDice != 8 &&
typeOfDice != 10 &&
typeOfDice != 12 &&
typeOfDice != 20 &&
typeOfDice != 100)
对于|| operator，如果您为骰子选择了正确的值，则if求值始终为true
例如，假设你的用户选择了一个骰子=4，现在这个骰子值（4）不同于骰子值6（或其他可接受的值），因此你的条件总是会找到一个真实的条件，并且你的代码会打印错误消息
此外，我希望向您介绍enum关键字。
public enum DiceType
{
FourSides = 4,
SixSides= 6,
EightSides = 8,
TenSides = 10,
TwelveSides = 12,
TwentySides = 20,
Percentage = 100
}
现在，您不用幻数，而是使用这种枚举类型的变量
Random roll = new Random();
while(true)
{
// Request dice type from user
Console.WriteLine("Please input the type of dice you want to roll. ");
// Display dice types to user
Console.WriteLine("4) Four-sided");
Console.WriteLine("6) Six-sided");
Console.WriteLine("8) Eight-sided");
Console.WriteLine("10) Ten-sided");
Console.WriteLine("12) Twelve-sided");
Console.WriteLine("20) Twenty-sided");
Console.WriteLine("100) Percentage");
Console.WriteLine(" ");
Console.WriteLine("Type quit to exit ");
// Take dice type from user
Console.Write("Type of Dice: ");
string input = Console.ReadLine();
if(input == "quit")
break;
DiceType typeOfDice;
// Try to parse the input and check if it could be an enum of the
// desidered type (Note user can also input "foursides" not just 4
if (!Enum.TryParse<DiceType>(input, true, out typeOfDice) ||
!Enum.IsDefined(typeof(DiceType), typeOfDice))
Console.WriteLine("That is not an acceptable die type. Please try again.");
else
{
....
switch (typeOfDice)
{
case DiceType.FourSides:
.....
break;
case DiceType.SixSides:
.....
break;
....
}
}
}
我还删除了goto代码。我在代码周围添加了一个无限循环，而不是这种著名的坏做法。菜单中的一个新选项（退出）允许用户退出循环并终止程序