Question

How to Convert Float to Hex?

Asked by: Dain_Anderson

Hello Experts,

I've got a column of "float" datatype, and I am wanting to convert the data into Hexadecimal on-the-fly for output.

For example, my value of 1595833113 (float) would result in 5F1E7B19. In mySQL, I can use the Hex() function -- is there an equivalent in MSSQL 2000? If not, what are the steps required to get the data in Hex format? I've attempted many differnt combinations of Cast() with no luck.

Thanks for the help,
-Dain

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Asked On
2006-09-21 at 04:44:07ID21997561
Tags

float

,

hex

,

convert

Topic

MS SQL Server

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: TimCotteePosted on 2006-09-21 at 04:51:15ID: 17568213

Hi Dain_Anderson,

Select Replace(master.dbo.fn_varbintohexstr(cast(1595833113 as varbinary)),'0x','')

Will get you a varchar containing the hex value from the float.

Tim Cottee

 

by: TimCotteePosted on 2006-09-21 at 04:52:12ID: 17568218

Dain_Anderson,

In fact you don't even need the cast to varbinary as this can be done implicitly:

Select Replace(master.dbo.fn_varbintohexstr(1595833113),'0x','')


Tim

 

by: Dain_AndersonPosted on 2006-09-21 at 05:20:36ID: 17568356

Hi Tim,

I think I'm getting close, but it's my lack of knowledge that's causing the issue here.

Your SQL returns:

41d7c79ec6400000 (or 0x41d7c79ec6400000 without the Replace() function) for the float value of 1595833113.

If I enter the value of 1595833113 into a sceintific calculator, and click the Hex option, the value returned is 5F1E7B19, which is what I'm trying to get in my output. I'm at a loss on this one -- any ideas?

Thanks you so much for replying,
-Dain

 

by: TimCotteePosted on 2006-09-21 at 05:24:12ID: 17568378

Dain_Anderson,

Very strange, when I run it it gives me 0x5f1e7b19 as expected. My fault I guess, I just used a static value of 1595833113 instead of casting it to a float. If it is a float then it gives the hex value you show. However casting this to int seems to work:

Compare the results of:
Select Replace(master.dbo.fn_varbintohexstr(cast(cast(1595833113 as float) as int)),'','')
with
Select Replace(master.dbo.fn_varbintohexstr(cast(1595833113 as float)),'','')

Tim

 

by: Dain_AndersonPosted on 2006-09-21 at 05:34:12ID: 17568452

Hi Tim,

For some reason, it's not treating the column value of 1595833113 as static, so when I run the CAST as int, it throws an error:

Arithmetic overflow error for type int, value = 3972869579.000000

If I hard-code the 1595833113 value in the SQL statement, all is fine, but when I use the value stored in the column, it won't cast to integer:

Replace(master.dbo.fn_varbintohexstr(cast(cast(R.CRC32 as float) as int)),'','') as CRC32

-Dain

 

by: TimCotteePosted on 2006-09-21 at 05:40:43ID: 17568495

Dain_Anderson,

Too big for an integer datatype I guess. You could cast it to a bigint which has a larger capacity and seems to work though you will get some leading zeros in the result which you could strip out.

Replace(master.dbo.fn_varbintohexstr(cast(R.CRC32 as bigint)),'','') as CRC32


Tim

 

by: Dain_AndersonPosted on 2006-09-21 at 05:57:05ID: 17568612

Thanks, Tim -- that worked perfectly. I can certainly deal with a few zeros!

Much appreciated,
-Dain

20120131-EE-VQP-002

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