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## Rounding Decimal value get wrong result

 Author Message ada.xi SSC Rookie Group: General Forum Members Points: 37 Visits: 10 hi all,I try to give a expression to round some filed like below,Round(Fields!unit_price.Value, Fields!Dom_Price_Places.Value) ---- Fields!unit_price.Value(decimal(18,8)) ----Fields!Dom_Price_Places.Value(tinyint) now I run into a one Fields!unit_price.Value=2.34500000, Fields!Dom_Price_Places.Value=2What I get is Round(CDec("2.34500000"), 2) return 2.34.Round(2.34500000, 2) return 2.35What's the difference here? Is this a bug?And help would be appreciated. Thanks, ada.xi SSC Rookie Group: General Forum Members Points: 37 Visits: 10 Any Help? thanks Lynn Pettis SSC Guru Group: General Forum Members Points: 167425 Visits: 39480 ada.xi (1/25/2011)hi all,I try to give a expression to round some filed like below,Round(Fields!unit_price.Value, Fields!Dom_Price_Places.Value) ---- Fields!unit_price.Value(decimal(18,8)) ----Fields!Dom_Price_Places.Value(tinyint) now I run into a one Fields!unit_price.Value=2.34500000, Fields!Dom_Price_Places.Value=2What I get is Round(CDec("2.34500000"), 2) return 2.34.Round(2.34500000, 2) return 2.35What's the difference here? Is this a bug?And help would be appreciated. Thanks,What is CDec? I can't find it in BOL anywhere.My guess, CDec is converting "2.34500000" to 2.34, not 2.345. Lynn PettisFor better assistance in answering your questions, click hereFor tips to get better help with Performance Problems, click hereFor Running Totals and its variations, click here or when working with partitioned tablesFor more about Tally Tables, click hereFor more about Cross Tabs and Pivots, click here and hereManaging Transaction LogsSQL Musings from the Desert Fountain Valley SQL (My Mirror Blog) ada.xi SSC Rookie Group: General Forum Members Points: 37 Visits: 10 Cdec ---Convert to Decimal.And (CDec("2.34500000")=2.34500000) return true. Lynn Pettis SSC Guru Group: General Forum Members Points: 167425 Visits: 39480 ada.xi (1/25/2011)Cdec ---Convert to Decimal.In what? As I said, I can't find it anywhere in Books Online. Lynn PettisFor better assistance in answering your questions, click hereFor tips to get better help with Performance Problems, click hereFor Running Totals and its variations, click here or when working with partitioned tablesFor more about Tally Tables, click hereFor more about Cross Tabs and Pivots, click here and hereManaging Transaction LogsSQL Musings from the Desert Fountain Valley SQL (My Mirror Blog) Lynn Pettis SSC Guru Group: General Forum Members Points: 167425 Visits: 39480 Lynn Pettis (1/25/2011)ada.xi (1/25/2011)Cdec ---Convert to Decimal.In what? As I said, I can't find it anywhere in Books Online.Nevermind, I found it in the Visual Studio Help System, it is a VB function. Lynn PettisFor better assistance in answering your questions, click hereFor tips to get better help with Performance Problems, click hereFor Running Totals and its variations, click here or when working with partitioned tablesFor more about Tally Tables, click hereFor more about Cross Tabs and Pivots, click here and hereManaging Transaction LogsSQL Musings from the Desert Fountain Valley SQL (My Mirror Blog) Daniel Bowlin SSChampion Group: General Forum Members Points: 13524 Visits: 2629 You say thatRound(CDec("2.34500000"), 2) return 2.34.but it should beRound(2.34500000, 2) return 2.35What happens when the number is 2.35500000 does it return2.35 or 2.36?If it returns 2.36 you are encountering something called banker's rounding where a 5 will round up to an even number, but a 5 will round down if the round up number is odd. In other words the 5 will alway round in the direction of the even number whether that is up or down.Without the long explanation of why banker's rounding exists, most people just code around it by testing the digit they are rounding and if it is a 5 they will add a value of 1 to that digit to make sure it rounds up.Hope this helps. Doug Lane SSC Eights! Group: General Forum Members Points: 965 Visits: 14618 Daniel Bowlin (1/27/2011)If it returns 2.36 you are encountering something called banker's rounding where a 5 will round up to an even number, but a 5 will round down if the round up number is odd. In other words the 5 will alway round in the direction of the even number whether that is up or down.I think the use of CDec is invoking the bankers rounding somehow. Try dropping that function if you can; maybe put the rounding in the query if that's possible.For what it's worth, here's something more from MSDN:When the fractional part is exactly 0.5, CInt and CLng always round it to the nearest even number. For example, 0.5 rounds to 0 and 1.5 rounds to 2. CInt and CLng differ from the Fix and Int functions, which truncate, rather than round, the fractional part of a number. Also, Fix and Int always return a value of the same type as is passed in.Though it doesn't include CDec in that list, I wouldn't be surprised if it behaves like CInt and CLng.

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