decimal rounding down when supposed to be up?

i have a dim at 11.8750 set to 2 place and it shows 11.87. what gives?
am i missing something here. is this a bug?

 

i did not type it myself, never do, the model geometry is 11.87498 so
the 2nd 8 rounds the 9 to 0 and the 4 to a 5 and then should round the
7 to an 8 if i set it to 2 place, unless i was asleep back in what 3rd
or 4th grade? ;0)

 

how does that make sense, what i learned was 5 and above rounds up 4
and below rounds down if a 9 rounds a 4 to a 5 then it rounds the next
numbers as well all the back towards the decimal. does this not apply
to solidworks?

 

Maybe another way of looking at it is that where you have 11.87498, and your
last significant place is at 2 decimal places, then what's the value of the
digits below that point? In this case, those digits would be 498, which is
less than 5, so therefore your last significant digit doesn't get pushed up.

WT

 

got it. i just had another guy go over it with me too. apparently i am
a complete fn dumbass that really was sleeping. i have always done it
my way 5-9 rounds up, 0-4 rounds down. I STAND CORRECTED. hmmmm
something to think about.

 

It isn't 5 though, it is 4. SW is rounding from the number it keeps
internally, not the previous display of digits.

 

And if your following ANSI (possibly ISO) dimensioning standards, only
dimensions that have a odd number preceding the 5 get rounded up, other wise
it doesn't. For instance, .875 rounded to 2 digits is .88, while .625 is
..62 Hope that helps confuse things further

Ken

 

What you are doing is complicating the rounding process

11.87498
rounds up to 11.875 at 3 and 4 places

but at 2 places it rounds down to 11.87

what you are doing to over complicate is you are rounding to 3 places
and then rounding again to 2

the deal is 11.87498 .00498 is less than .005 so it rounds down when
limited to 2 places. It still follows the same rule just it is only
evaluating the rule one time you are evaluating it 2 or 3 times.

 

you are right - 5-9 rounds up, 0-4 rounds down. you just need to stop
looking at all of the digits past the one next to the digit you want to
round.

this will be difficult because bob z. knows how paranoid you are.
:~)>

bob z.
p.s. smaller and smaller...

 

Must have been because when we were in 3rd or 4th grade, they were using
abacuss's or slide rules to do calculations and never got past 3 decimal
places.