如何生成随机数学运算 [英] How to generate random math operation

问题描述

我的代码有什么问题？我想创建一个函数，它将调用一个随机数和多个或者除以（以随机顺序）。当我启动应用程序时，乘法（或除法）的总结果有时是正确的，但有时只等于0.

我应该如何解决问题？



我尝试过：

随机rand = new Random（）; 
 int num1 = rand.Next（1,15）; 
 int num2 = rand.Next（1,15）; 
 int RandOperation = rand.Next（1,100）; 
 if（RandOperation％2 == 0）
 {
 if（num2％num1 == 0& num2> num1）
 {
 Display.Text = Convert.ToString（num2）+/+ Convert.ToString（num1）; 
 total = num2 / num1; 
} 
 
 else 
 {
 if（num1％num2 == 0& num1> num2）
 {
 Display.Text = Convert.ToString（num1）+/+ Convert.ToString（num2）; 
 total = num1 / num2; 
} 
} 
} 
其他
 {
 Display.Text = Convert.ToString（num1）+*+ Convert.ToString（num2） ; 
 total = num1 * num2; 
} 
 

解决方案

嗯......如果num1是11且num2是14，那么会发生什么？RandOperation是74？

它通过了这个测试：

  if （RandOperation％  2  ==  0 ）
 

但是它没有通过这个测试：

  if （num2％num1 ==  0 & num2 >  num1）
 

它没有通过这个测试：

  if （num1％num2 ==  0 & num1 >  num2）
 

所以..根本不对总计做任何事情，你得到零。

试一试：使用调试器并按照执行通过 - 你会明白我的意思！



< b>好的我会尝试，但也许有一种简单的方法可以产生我想要的东西？



嗯......这将取决于正是你想要的！ ：笑：

我不确定你为什么要在if条件下使用余数 - 我这样做的方式有点简单：

< pre lang =c＃>随机rand = new Random（）;
int num1 = rand.Next（ 1 ， 15 ）;
int num2 = rand.Next（ 1 ， 15 ）;
int RandOperation = rand.Next（ 0 ， 2 ）;
if （RandOperation == 0 ）
{
if （num1 < num2）
{
int temp = num1;
num1 = num2;
num2 = temp;
}
Display.Text = string .Format（ {0} / {1}，num1，num2）;
total = num1 / num2;
}
else
{
Display.Text = string .Format（ {0} * {1}，num1，num2）;
total = num1 * num2;
}

What's wrong in my code? I want to create function which will call a random numbers and multiple that or divide(in the random order). When I start the app, total result of multiplication(or division) is sometimes correct, but sometimes just equal 0.
How should I solve the problem?

What I have tried:

   Random rand = new Random();
           int num1 = rand.Next(1,15);
           int num2 = rand.Next(1,15);
int RandOperation = rand.Next(1,100);
           if (RandOperation % 2 == 0)
           {
               if (num2 % num1 == 0 & num2 > num1)
               {
                   Display.Text = Convert.ToString(num2) + "/" + Convert.ToString(num1);
                   total = num2 / num1;
               }

               else
               {
                   if (num1 % num2 == 0 & num1 > num2)
                   {
                       Display.Text = Convert.ToString(num1) + "/" + Convert.ToString(num2);
                       total = num1 / num2;
                   }
               }
           }
           else
           {
               Display.Text = Convert.ToString(num1) + "*" + Convert.ToString(num2);
               total = num1 * num2;
           }

解决方案

Well...What happens if num1 is 11 and num2 is 14, and RandOperation is 74?
It passes this test:

if (RandOperation % 2 == 0)

But it fails this test:

if (num2 % num1 == 0 & num2 > num1)

And it fails this test:

if (num1 % num2 == 0 & num1 > num2)

So...it doesn't do anything to total at all, and you get a zero.
Try it: use the debugger and follow the execution through - you'll see what I mean!

"Ok I will try, but maybe there is a simple way to generate what I want?"

Well...that's going to depend on exactly what you want! :laugh:
I'm not sure why you are using the remainder in the if conditions at all - the way I'd do it is a bit simpler:

Random rand = new Random();
int num1 = rand.Next(1, 15);
int num2 = rand.Next(1, 15);
int RandOperation = rand.Next(0, 2);
if (RandOperation == 0)
    {
    if (num1 < num2)
        {
        int temp = num1;
        num1 = num2;
        num2 = temp;
        }
    Display.Text = string.Format("{0} / {1}", num1, num2);
    total = num1 / num2;
    }
else
    {
    Display.Text = string.Format("{0} * {1}", num1, num2);
    total = num1 * num2;
    }

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