创建随机数？（在控制台中） [英] create Random Numbers?(in Console)

问题描述

我怎样才能创建4位数的随机数？不使用结构循环和结构条件（例如Loop for，while，if，...）并且不使用Timer

此程序的结果如此程序：



4位数生成必须不同，例如，如果返回1111为假。但结果1234是真的。

Hi,How can I create 4-digit Random Numbers? without use Structural Loops and Structural condition (for example Loop for,while,if,...) and without use from Timer
result of this program like this program:

4-digit Produced Must different for example if return 1111 is false. but result 1234 is true.

static void Main(string[] args)
       {
           Random Item = new Random();
 
           int Num1, Num2, Num3, Num4;
           do
           {
               Num1 = Item.Next(0, 10);
               Num2 = Item.Next(0, 10);
               Num3 = Item.Next(0, 10);
               Num4 = Item.Next(0, 10);
 
           } while (Num1 == Num2 || Num1 == Num3 || Num1 == Num4 || Num2 == Num3 || Num2 == Num4 || Num3 == Num4);
 
           Console.WriteLine("{0}{1}{2}{3}", Num1, Num2, Num3, Num4);
           Console.ReadKey();
       }

推荐答案

将数字0 - 9粘贴在一个列表中。随机拉出一个（并从列表中删除）。再做三次。

Stick the numbers 0 - 9 in a list. Pull one out at random (and remove from list). Do three more times.

不使用计时器只是胡言乱语。我建议使用 System.DateTime.Now ，而不是计时器，用于随机数生成器，遵循Microsoft源代码（参见）：如何创建随机数？ [ ^ ]。



Microsoft建议

"Without use from Timer" is just gibberish. I advised to use System.DateTime.Now, not timer, for random number generator, following Microsoft source code (see it): How Can I create Random Numbers?[^].

Microsoft recommends

new Random((int) DateTime.Now.Ticks & 0x0000FFFF);

但我会避免使用

but I would avoid type cast by using

System.Random Item = new System.Random(System.DateTime.Now.Ticks.GetHashCode());

现在，你的问题没有解释。你的代码应该可以运行，但也许它远非最优。



请参阅解决方案2，以便更好地解释你能做得更好。



你的工作还有一个问题：不要在控制台中开发随机数。始终从任何UI和其他不相关的方面抽象出您的解决方案，使它们具有普遍性。你应该开发一个单独的功能。比如，它可以接受 Random 的实例和作为参数的位数，或者更通用。 Random 应该是一个参数，而不是在函数内创建的对象，所以这个对象可以在外面创建并可以重复使用。

-SA

Now, your "problem" is not explained. Your code should work, but perhaps it's far from optimal.

See Solution 2 for good explanation of what could you better do.

One more problem with your work: don't develop "random number in console". Always abstract out your solutions from any UI and other unrelated aspects, make them universal. You should develop a separate function. Say, it may accept an instance of Random and number of digits as parameters, or be more universal. Random should really be a parameter, not object created inside a function, so this object could be created outside and be reusable.

—SA

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