Re: Slightly OT: Rounding Negative Numbers

I would think -0.875 would round up therefore -0.87 is my guess.

Rick

                                                                                                                   
                    Bill Buchan                                                                                    
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                    root_at_fatcity.c                                                                                 
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                    08/28/2002                                                                                     
                    11:58 AM                                                                                       
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I'm trying to consolidate some numbers generated by a PL/SQL report vs. a Java based report and these seem to be out due to rounding errors on negative numbers.

In PL/SQL if I for example, round to 2 decimal places:

SQL> select round(-0.875,2) from dual;

ROUND(-0.875,2)

            -.88

In Java:

import java.*;

public class Round {

         public static void main(String[] args) {
                 double a = -0.875;
                 int i = (int)java.lang.Math.round(a*100);
                 double z = i;
                 z  = z / 100;
                 System.out.println(z);
                 }
         }

>java Round

-0.87

which is 0.01 different (1 pence in this case). If I use positive numbers (+0.875) when the answer is 0.88 for both PL/SQL and Java. PL/SQL's answer

looks "more"correct to me for the negative value - but what is the mathematically correct rounding of -0.875?!

Thanks!

• Bill.

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