Hello,

entering the following commands

N[Log[10^3]/Log[10], 20] N[Log[10^3]/Log[10] + 1., 20] Floor[%]

in mathematica 8 I get the following output:

3.0000 4. 3

I think, of course, the last output should be 4 and not 3. Otherwise one would have Floor[4.]=3 and this is nonsense.

In consequence there is an additional similiar problem. Entering Floor@(Log[10, 10^Range[10]] + 1) Floor@(Log[10^Range[10]]/Log[10] + 1.)

one gets as output {2, 3, 4, 5, 6, 7, 8, 9, 10, 11} {2, 3, 3, 5, 5, 6, 7, 9, 9, 10}

My students and me were very astonished and could not understand mathematica outputting such obvious nonsense (the last output agaim). Of course, both outputlines should be identical.

Could someone in the community give me an advice? Thanks in advance!

Peter Quedens