# Best way to get whole number part of a Decimal number

### Question

What is the best way to return the whole number part of a decimal (in c#)? (This has to work for very large numbers that may not fit into an int).

``````GetIntPart(343564564.4342) >> 343564564
GetIntPart(-323489.32) >> -323489
GetIntPart(324) >> 324
``````

The purpose of this is: I am inserting into a decimal (30,4) field in the db, and want to ensure that I do not try to insert a number than is too long for the field. Determining the length of the whole number part of the decimal is part of this operation.

1
76
10/17/2015 1:00:49 PM

By the way guys, (int)Decimal.MaxValue will overflow. You can't get the "int" part of a decimal because the decimal is too friggen big to put in the int box. Just checked... its even too big for a long (Int64).

If you want the bit of a Decimal value to the LEFT of the dot, you need to do this:

``````Math.Truncate(number)
``````

and return the value as... A DECIMAL or a DOUBLE.

edit: Truncate is definitely the correct function!

185
7/21/2011 12:26:00 PM

I think System.Math.Truncate is what you're looking for.