你如何将它四舍五入到最接近的整数？ [英] How do you round it to the closest whole number?

问题描述

嗨


我写了下面的代码来分割2个数字而没有回答答案：

Hi
I've written the following code to divide the 2 numbers without rounding the answer:

double a, b, c;
            a = double.Parse(textBox1.Text);
            b = double.Parse(textBox2.Text);

            c = a / b;

            label1.Text = c.ToString();

如何使数字更圆？



我尝试过的事情：



我只试过/运营商。我是C＃的新手，因此我不知道还能尝试什么。

How do I make it round the number up?

What I have tried:

I've only tried the / operator. I'm new to C# therefore I don't know what else I can try.

推荐答案

首先，不要使用double.Parse来转换用户输入 - 如果他们犯了一个小错误，你的应用程序将崩溃。使用 Double.TryParse方法（String，Double）（系统） [ ^ ]而是：

To start with, don't use double.Parse to convert user input - if they make a single tiny mistake your app will crash. Use the Double.TryParse Method (String, Double) (System)[^] instead:

double a;
if (!double.TryParse(textBox1.Text, out a))
   {
   ... report problem to user ...
   return;
   }
double b;
if (!double.TryParse(textBox2.Text, out b))
   {
   ... report problem to user ...
   return;
   }

请记住，用户一直在输入错误，就像我们一样！ ：笑：



然后你可以使用 Math.Round方法（双重）（系统） [ ^ ]或 Math.Round方法（Double，Int32）（系统） [ ^ ]舍入计算结果。

Remember, users make typing mistakes all the time, just as we do! :laugh:

Then you can use either the Math.Round Method (Double) (System)[^] or Math.Round Method (Double, Int32) (System)[^] to round the result of your calculation.

label1.Text = Math.Round(a / b).ToString();

BTW：帮自己一个忙，停止使用Visual Studio所有内容的默认名称 - 您可能还记得今天的TextBox8是手机号码，但是当您需要在三周内修改它时，您会这样做吗？使用描述性名称 - 例如tbMobileNo - 您的代码变得更容易阅读，更自我记录，更易于维护 - 并且编码速度更快，因为Intellisense可以通过三次击键来tbMobile，其中TextBox8需要思考大概和8次击键......

BTW: Do yourself a favour, and stop using Visual Studio default names for everything - you may remember that "TextBox8" is the mobile number today, but when you have to modify it in three weeks time, will you then? Use descriptive names - "tbMobileNo" for example - and your code becomes easier to read, more self documenting, easier to maintain - and surprisingly quicker to code because Intellisense can get to to "tbMobile" in three keystrokes, where "TextBox8" takes thinking about and 8 keystrokes...

Math.Ceiling方法（系统） [ ^ ]

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