How do I convert (ie: decimal (3.31)) to decimal (ie: 3.00)

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I have a small program that generates a random decimal amount. I want to extract the leading whole number from the generated number, but keep the fractional part (".00").
I'd also like to keep this a decimal.

What I have tried:

I have tried just about every math function I can find in visual basic and on the web. I must be missing something.

Posted 20-Sep-18 14:53pm

User 13790648

Updated 20-Sep-18 20:14pm

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3 solutions

Solution 1

What is wrong with floor?

After using it, you just have to format you number to have .00 decimals again and that's it

Posted 20-Sep-18 19:45pm

Nelek

Comments

Maciej Los 21-Sep-18 2:14am

5ed!

Nelek 21-Sep-18 11:40am

thanks

[no name] 21-Sep-18 9:11am

Thank you.

Nelek 21-Sep-18 11:39am

You are welcome

Solution 2

Have yoi tried Decimal.Truncate(Decimal) Method (System) | Microsoft Docs[^] - that is what it is designed to do...

decimal d = 3.31M;
Console.WriteLine("{0}, {1}, {1:0.00}", d, decimal.Truncate(d));

Dim d As Decimal = 3.31D
Console.WriteLine("{0}, {1}, {1:0.00}", d, Decimal.Truncate(d))

Posted 20-Sep-18 19:46pm

OriginalGriff

Updated 20-Sep-18 19:47pm

v2

Comments

Maciej Los 21-Sep-18 2:14am

5ed!

[no name] 21-Sep-18 9:12am

Thank You.

OriginalGriff 21-Sep-18 9:59am

You're welcome!

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Maciej Los · Accepted Answer · 2018-09-20T20:15:00

First of all, i'd strongly recommend to read about:
Decimal Data Type (Visual Basic) | Microsoft Docs[^]
Integer Data Type (Visual Basic) | Microsoft Docs[^]
Implicit and Explicit Conversions (Visual Basic) | Microsoft Docs[^]
How to: Convert an Object to Another Type in Visual Basic | Microsoft Docs[^]
Type Conversion Functions (Visual Basic) | Microsoft Docs[^]
Standard Numeric Format Strings | Microsoft Docs[^]
Custom Numeric Format Strings | Microsoft Docs[^]
And the most important:
What Every Computer Scientist Should Know About Floating-Point Arithmetic[^]

Now, take a look at below code:

VB.NET

Dim df As Decimal = 3.31D
Dim di As Integer = df

Console.WriteLine("{0} => {1}", df, di)
df=di
Console.WriteLine("{0:0.00} => {1}", df, di)