Steve Erbach
erbachs at gmail.com
Tue Mar 21 12:05:20 CST 2006
Josh, I hear you on the cutoff. I tried converting by hand the decimal number 1.07 to hex and got 1.11EB85 before I stopped. I did find an on-line calculator: http://babbage.cs.qc.edu/courses/cs341/IEEE-754.html Apparently, there's a standard way to represent floating point numbers in hex, but the resulting Hex number doesn't have a "decimal" point. For example, 1.07 (decimal) comes out as 3FF11EB851EB851F using a 64-bit double precision hex number. You can see the string "11EB85" in that number, the same that I came up with manually, but I'm still puzzling over the beginning 3FF. The site has the complete JavaScript code for the conversion, so maybe I can figure out what the 3FF is for. Thanks, Steve Erbach http://TheTownCrank.blogspot.com On 3/21/06, Josh McFarlane <darsant at gmail.com> wrote: > On 3/21/06, Steve Erbach <erbachs at gmail.com> wrote: > > Dear Group, > > > > There are about a jillion decimal to hex converters on the web. But > > what I'm looking for is a converter that will handle decimal numbers > > with decimals. That is, convert 1.0625 (decimal) to 1.1 > > (hexadecimal). I can write one that recursively takes the remainder > > from a division by higher and higher powers of 16 and dividing the > > remainder the the next higher power of sixteen, etc. Just wondered if > > any of you had seen such a utility. > > Are you looking for something for integration into a system, or > something for personal use? > > Problem with trying to represent a floating decimal based number in a > different system is that you can't always get an exact value for the > number you want to represent, so any cnoversion utility would have to > have a cutoff point. > > I've tinkered with a C++ app to do it for me, but it's not anywhere > near professional, just a toy. > > -- > Josh McFarlane