How to add value with 2 decimal to the list<double>? if the value is 1.1, it should add 1.10 into the list<double>

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how to add value with 2 decimal to the List?? If the value is 1.1, it should add 1.10 into the List

What I have tried:

tried Math.Round(Dobule, 2). But did not work

Posted 21-May-20 2:21am

kamalcodeproject

Updated 21-May-20 3:53am

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3 solutions

Solution 2

In addition to solution #1 by phil.o i'd suggest to read this: Floating Point Demystified, Part 1[^]

Posted 21-May-20 3:46am

Maciej Los

Solution 3

Quote:
As i mentioned, i want to add with 2 decimal to the List<double>

Your sentence means that you don't understand what is a double. As already told in Solution 1, 1.1 and 1.10 are exactly the same value.
To reduce decimals, rounding can be done.
To enforce 2 decimals, the only way is formatting while converting to string.

Posted 21-May-20 3:54am

Patrice T

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phil.o · Accepted Answer · 2020-05-21T02:29:00

Solution 1

Don't confuse a value with its string representation.
Mathematically, 1.1, 1.10, 1.100, ..., 1.10000000000 are all the same value. On presentation to the end user, you can chose to represent the number of decimals you want.

C#

double value = 1.1;
Console.WriteLine(value.ToString("F1")); // prints 1.1
Console.WriteLine(value.ToString("F2")); // prints 1.10
Console.WriteLine(value.ToString("F3")); // prints 1.100
Console.WriteLine(value.ToString("F4")); // prints 1.1000

Posted 21-May-20 2:29am

phil.o

Updated 21-May-20 3:06am

v2

Comments

Maciej Los 21-May-20 8:45am

5ed!

phil.o 21-May-20 9:05am

Thank you Maciej :)

CPallini 21-May-20 8:52am

Have also my 5.

phil.o 21-May-20 9:05am

Thank you Carlo :)

kamalcodeproject 21-May-20 9:11am

Hey,
As i mentioned, i want to add with 2 decimal to the List<double> and that needs to be bind on Drop down on UI.

I know string manipulation.

Maciej Los 21-May-20 9:13am

So, use List<string> ;)

kamalcodeproject 21-May-20 9:15am

Do we have option with List<double> or not. that is my question.

phil.o 21-May-20 9:29am

You add a double value to the list. Only when you present the data to the end user, then the string representation becomes relevant. You seem to still think that 1.1 and 1.10 are two distinct values; they are not.