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Actually, this isn't quite the whole story. Most everyone follows the IEEE convention of "round towards nearest or even."
Examples (rounding all of these to the one's place):

2.51 becomes 3 (this is the 'nearest' rule, which always comes first)
2.49 becomes 2 (again, 'nearest')

However, what happens if you have 2.50 ? Which way do you round it... 'tis no nearer to 2 than to 3. The IEEE standard says if there is a tie, round to the even number.

2.50 becomes 2
3.50 becomes 4

You have to pick up or down... this method is consistent and thus tends to make your errors (statistically) smaller.


In reply to Re: Re: Re: Using (s)printf() by Anonymous Monk
in thread Using (s)printf() by reptile

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