Comments on: Spot the Bug

By: extremoyun

extremoyun — Thu, 17 Jul 2008 08:27:42 +0000

.Use BigDecimal and NumberFormat class to format the output. Thank

By: rixoyun

rixoyun — Wed, 16 Jul 2008 11:50:25 +0000

Zack: If MzScheme indeed prints that, it is violating the Scheme standard, which requires that all inexact numbers be printed using the nearest exact numeral. Python is doing the right thing.

By: kral oyun

kral oyun — Wed, 16 Jul 2008 11:48:18 +0000

are expressed as fractions in binary formats , so using double as data type for these would have caused the problem.
no problem

By: cenk oyun

cenk oyun — Wed, 16 Jul 2008 10:25:50 +0000

Problem description:
In Java floating points are expressed as fractions in binary formats , so using double as data type for these would have caused the problem.
no problem

By: David Madden

David Madden — Tue, 22 Apr 2008 21:42:53 +0000

Take a look at this post: http://jug.org.ua/wiki/display/JavaAlmanac/The+Need+for+BigDecimal+-+Core+Java+Technology+Tech+Tips

By: John Cowan

John Cowan — Mon, 10 Mar 2008 03:58:13 +0000

Alan Little: Cobol does indeed allow you to say DECIMAL POINT IS COMMA, and you can insert punctuation editing characters wherever you like — you aren’t restricted to putting one every three places. In any case, Indian numbers aren’t every four places: it’s one thousand = 1,000; one lakh (10^5) = 1,00,000, and one crore (10^7) = 1,00,00,000. It’s Archimede’s Sand Reckoner that worked in multiples of one myriad (10^4).

Zack: If MzScheme indeed prints that, it is violating the Scheme standard, which requires that all inexact numbers be printed using the nearest exact numeral. Python is doing the right thing.

By: MHMD

MHMD — Wed, 05 Mar 2008 07:38:26 +0000

Hi,

My perspective about analyzing the above code in java would be,

BUG:
Total:9.879999999999999
Expected:
Total:9.88
Problem description:
In Java floating points are expressed as fractions in binary formats , so using double as data type for these would have caused the problem.

Solution:
Quick Fix:

1.Use float instead of double that would give the exact answer need for this case.
2.In case if the double is needed in anyways then use NumberFormat class to format the output

Original Solution:
1.Use BigDecimal and NumberFormat class to format the output.

By: Pat Farrell

Pat Farrell — Thu, 14 Feb 2008 03:38:13 +0000

There may be more, but the criminal sin is using floating point for money.

Any language used by folks who might use money to do anything, needs a Money or Currency intrinsic type so that rookie programmers don’t shoot themselves in the feet using floating point.

I’m not asking for Euro to Pounds Sterling to Dollars, just a Money datatype.

By: duncan

duncan — Mon, 11 Feb 2008 23:32:39 +0000

The upstream commenters who point out that some code will have to deal with amounts less than one cent are of course correct, but if you know you will only be dealing with US currency and that you will not have to deal with fractions of a penny, handling currency in pennies makes a lot of sense as a defensive measure. It’s not always appropriate, but where it is I don’t see a problem with it.

By: aadis

aadis — Mon, 11 Feb 2008 03:56:52 +0000

And the shipping URL page should have the order number string pre-appended (like “shipping.jsp?order=#####”). Another less semantic load