0% the new Y2K? - Page 2

Admiral Huddy · 12-01-2009, 15:10

Quote:

Originally Posted by Grandad

Great stuff, made a mint from Y2K , about time we had another

Bless those days which paid for half my house

Mark · 12-01-2009, 17:42

Likewise, though in my case they just meant I had more to waste/have less debt.

borris · 13-01-2009, 17:12

Japan have had implied negative (risk free) rates on short dated deposits on a number of occasions, and it's not caused them any problems.

Divide by zero would never be a problem either, as the interest rate is always (1 + r), not r.

Admiral Huddy · 13-01-2009, 17:15

I see - problem is our legacy software is based on a database which is 25+ years old.

borris · 13-01-2009, 17:27

It still shouldn't be a problem - There should never be an occasion where you actually divide by the zero. At zero interest, you would multiply / divide by 1 (for -1%, you would divide/multiply by 0.99).

This does assume that the original coders followed at least basic maths. Which is not a very safe assumption.

Just run a regression test with a zero rate, and see what breaks.

Then go on holiday.

Admiral Huddy · 13-01-2009, 17:52

Quote:

Originally Posted by borris

Which is not a very safe assumption.

Just run a regression test with a zero rate, and see what breaks.

Then go on holiday.

Exactly..

I've already found a few examples :

Code:

 
B4139C           B60AM2    DIV  RTE,J     WK2       H                                930518

mod date is on far right.. RTE is not checked fo 0.

Piggymon · 13-01-2009, 22:33

Welcome to BD Borris

iCraig · 14-01-2009, 00:21

Quote:

Originally Posted by Piggymon

Welcome to BD Borris

Your bruise has an account?

Piggymon · 14-01-2009, 08:25

LOL !

Borris the bruise has gone now \o/

Admiral Huddy · 05-02-2009, 13:06

Base rate is now at 1% and further cuts maybe on the cards.

13-01-2009, 17:15	#14
Admiral Huddy HOMO-Sapien Join Date: Jun 2006 Location: Chelmsford Posts: 6,692	I see - problem is our legacy software is based on a database which is 25+ years old. __________________ I just got lost in thought.. It was very unfamiliar territory. Techie Talk \| My gaming Blog \| PC spec \| The Admirals log

13-01-2009, 22:33	#17
Piggymon Lara Croft Join Date: Jun 2006 Location: PigmoPad - Braintree Essex Posts: 8,604	Welcome to BD Borris __________________ BF% 28/08/08 - 21%

14-01-2009, 08:25	#19
Piggymon Lara Croft Join Date: Jun 2006 Location: PigmoPad - Braintree Essex Posts: 8,604	LOL ! Borris the bruise has gone now \o/ __________________ BF% 28/08/08 - 21%

05-02-2009, 13:06	#20
Admiral Huddy HOMO-Sapien Join Date: Jun 2006 Location: Chelmsford Posts: 6,692	Base rate is now at 1% and further cuts maybe on the cards. __________________ I just got lost in thought.. It was very unfamiliar territory. Techie Talk \| My gaming Blog \| PC spec \| The Admirals log

12-01-2009, 17:42	#12
Mark Screaming Orgasm Join Date: Jul 2006 Location: Newbury Posts: 15,194	Likewise, though in my case they just meant I had more to waste/have less debt.

13-01-2009, 17:12	#13
borris Nice weak cup of Earl Grey Join Date: Jan 2009 Posts: 8	Japan have had implied negative (risk free) rates on short dated deposits on a number of occasions, and it's not caused them any problems. Divide by zero would never be a problem either, as the interest rate is always (1 + r), not r.

13-01-2009, 17:27	#15
borris Nice weak cup of Earl Grey Join Date: Jan 2009 Posts: 8	It still shouldn't be a problem - There should never be an occasion where you actually divide by the zero. At zero interest, you would multiply / divide by 1 (for -1%, you would divide/multiply by 0.99). This does assume that the original coders followed at least basic maths. Which is not a very safe assumption. Just run a regression test with a zero rate, and see what breaks. Then go on holiday.