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Why does Math.Ceiling return a double?
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QAIX > .Net Development > Why does Math.Ceiling return a double? 28 August 2008 14:46:47
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Why does Math.Ceiling return a double?

Brady Kelly 28 August 2008 14:46:47
 The documentation says, "Returns the smallest integer greater than or equal
to the specified double-precision floating-point number."


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Dean Cleaver 6 September 2007 16:06:15 [ permanent link ]
 Perhaps because doubles can represent numbers higher than int.MaxValue?

-----Original Message-----
From: Discussion of development on the .NET platform using any managed
language [mailto:D­OTNET-CLR@DISCUSS.DEVELOP.COM] On Behalf Of Brady
Kelly
Sent: Friday, 7 September 2007 00:04
To: DOTNET-CLR@DISCUSS.­DEVELOP.COM
Subject: [DOTNET-CLR] Why does Math.Ceiling return a double?

The documentation says, "Returns the smallest integer greater than or
equal
to the specified double-precision floating-point number."


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Daniel Petersson 6 September 2007 17:48:24 [ permanent link ]
 all math method returns double or the same type as their input parameter(s).
I think it is mostly an "API-thing". If you do math then you probably use doubles :)­
-- Daniel


___________________­____________________­_
From: Discussion of development on the .NET platform using any managed language [DOTNET-CLR@DISCUSS.DEVELOP.COM] On Behalf Of Dean Cleaver [dean.cleaver@XCEPTIONSOFTWARE.COM]
Sent: Thursday, September 06, 2007 2:06 PM
To: DOTNET-CLR@DISCUSS.­DEVELOP.COM
Subject: Re: [DOTNET-CLR] Why does Math.Ceiling return a double?

Perhaps because doubles can represent numbers higher than int.MaxValue?

-----Original Message-----
From: Discussion of development on the .NET platform using any managed
language [mailto:D­OTNET-CLR@DISCUSS.DEVELOP.COM] On Behalf Of Brady
Kelly
Sent: Friday, 7 September 2007 00:04
To: DOTNET-CLR@DISCUSS.­DEVELOP.COM
Subject: [DOTNET-CLR] Why does Math.Ceiling return a double?

The documentation says, "Returns the smallest integer greater than or
equal
to the specified double-precision floating-point number."


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Peter Ritchie 6 September 2007 18:22:41 [ permanent link ]
 Although Double doesn't have the precision for decimal digits for an
operand whose Math.Ceiling result would be different for values equivalent
to large Int64 values; that would depend on the value. i.e. you'd have to
check the value before calling Math.Ceiling.

If Math.Ceiling(Double­) returned Int64, you could get the correct value
for 1.33333E+4, but not for 1.33333E+30 (which would be
-922337203685477580­8 if simply cast to Int64). Yes, Math.Ceiling
(1.33333E+30) == 1.33333E+30; but you need Double to store 1.33333E+30.

On Fri, 7 Sep 2007 00:06:15 +1200, Dean Cleaver
<dean.cleaver@XCEPT­IONSOFTWARE.COM> wrote:

Perhaps because doubles can represent numbers higher than int.MaxValue?
-----Original Message-----
From: Discussion of development on the .NET platform using any managed
language [mailto:D­OTNET-CLR@DISCUSS.DEVELOP.COM] On Behalf Of Brady
Kelly
Sent: Friday, 7 September 2007 00:04
To: DOTNET-CLR@DISCUSS.­DEVELOP.COM
Subject: [DOTNET-CLR] Why does Math.Ceiling return a double?
The documentation says, "Returns the smallest integer greater than or
equal
to the specified double-precision floating-point number."

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Guest 28 August 2008 14:46:47 [ permanent link ]
 Then, the rigth documentation should say:

"Returns the smallest non-decimal (or non-fractional) double greater than or equal to the specified double-precision floating-point number."
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QAIX > .Net Development > Why does Math.Ceiling return a double? 28 August 2008 14:46:47
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