The way Java calculates round is (int)Math.floor(a + 0.5f)
So you could enforce your rounding algorithm this way:
import java.*;
public class Round {
public static void main(String[] args) {
double a = 0.875;
int i_rounded;
if (a >= 0) i_rounded = (int)java.lang.Math.round(a*100);
else i_rounded = (int)java.lang.Math.floor(a*100 -
0.5);
double z = i_rounded;
z = z / 100;
System.out.println(z);
}
}
Regards,
Waleed
-----Original Message-----
Sent: Wednesday, August 28, 2002 11:59 AM
To: Multiple recipients of list ORACLE-L
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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Author: Bill Buchan
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