How do you round it to the closest whole number?

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

C#

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

            c = a / b;

            label1.Text = c.ToString();

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.

Posted 16-Jun-18 1:00am

Member 13652359

Updated 16-Jun-18 15:08pm

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2 solutions

Solution 2

Math.Ceiling Method (System)[^]

Posted 16-Jun-18 15:09pm

Gerry Schmitz

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OriginalGriff · Accepted Answer · 2018-06-16T02:00:00

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:

C#

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;
   }

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.

C#

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

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...