F64 lib Updated.

[jack]

fixed the Round function (I hope)
added ExpTen
File:1->F64.zip

[upnorth]

Thank you Jack! Your efforts are greatly appreciated.

[freedimension]

for those that use the F64 lib by freedimension

Don't be that decent, it's also your lib now. I only brought it to live and you are keeping it alive now
Great work btw. Couldn't figure out what was wrong on that bug (don't like C that much )

[jack]

you are too kind, as my contribution is rather small.

[freedimension]

you are too kind, as my contribution is rather small.

but nonetheless important to the community

[jack]

thank you, btw i emailed the modified source code to you, compiles with MSVC 6.

[Xombie]

Howdy,

Shouldn't...

Code: Select all

a.double
b.double

F64_Val(a, "621.675000")
F64_Round(a, 2, b)
Debug F64_Str(b)

Return 621.68 and not 621.67? I'm using F64 version 0.95.

Great tool, by the way. Very very useful for me in many apps

[KarLKoX]

Hi Jack and thanx for updating this excellent lib wich i can't live without (really).
Keep up the good work

[jack]

Shouldn't...

Code: Select all

a.double
b.double

F64_Val(a, "621.675000")
F64_Round(a, 2, b)
Debug F64_Str(b)

Return 621.68 and not 621.67?

the function F64_Round rounds the value up, so the result is correct.
thanks KarLKoX and Xombie for the compliments

[Xombie]

That's what I mean. 621.675 when rounding to two decimal places the 5 should round 7 up to 8 right? So it should be 621.68, right? The code I posted returns 621.67 as if it's just returning two decimal places and not rounding at all.

[jack]

Sorry I misunderstood Xombie.
not sure it’s a bug, it seems to be standard practice to round-off if the fractional part is exactly 0.5
For example try this

Code: Select all

a.double 
b.double 

F64_Val(a, "621.675001") 
F64_Round(a, 2, b) 
Debug F64_Str(b) 

perhaps MrMath can shed some light on the subject?

[Dare2]

Could, perhaps, there be a roundUp() and a roundDown() function. Ceil() and Floor() or whatever?

[Xombie]

There are already floor and ceiling functions but those will round up or down regardless of the fraction. I'm looking for a function that rounds down on a fraction like 1.1 to 1.4 while rounding up for 1.5 to 1.9.

@jack - Everything I've been taught since a kid is that you round up on 0.5 or greater. Excel does the same. "=ROUND(621.275,2)" will equal '621.28', rounding up on the 0.5.

[jack]

fixed the Round function (I hope)
added ExpTen
File:1->F64.zip

[Dare2]

Might if be an idea to make two functions?

One that treats 0.5 as a round up (as I was taught in school) ..

.. and one that treats it as a round down.

For some reason - and I cannot recall why now - we used to add 0.49999' to a value and truncate. So 0.5 when down and anything above went up. I may have been to overcome an error in early MS FP (which was non-standard way back when in days of DOS) or it may have been to do with some financial calcs.

Anyhow, reason for suggesting two is that if there are two ways, the lib will always be doing it the wrong way for someone, whichever way you go.

Then again, maybe I'm talking cr@p. I just have this feeling, though.