Comments on: Money database property for Google App Engine http://www.redredred.com.au/money-database-property-for-google-app-engine/ redredred developers talk about what they are working on Wed, 21 Apr 2010 23:11:09 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Jonathan http://www.redredred.com.au/money-database-property-for-google-app-engine/comment-page-1/#comment-496 Jonathan Wed, 03 Feb 2010 06:41:07 +0000 http://www.redredred.com.au/?p=264#comment-496 Thanks for giving it a name. I didn't know what it was called. Thanks for giving it a name. I didn’t know what it was called.

]]> By: eli http://www.redredred.com.au/money-database-property-for-google-app-engine/comment-page-1/#comment-495 eli Wed, 03 Feb 2010 05:28:03 +0000 http://www.redredred.com.au/?p=264#comment-495 Did you consider doing Fixed Point for this? e.g. 100.24 would become 10024 or maybe 100240 in the db. You just decide how many digits to the right of the decimal you want to store... thus you avoid floating point errors. Then you just convert them when putting and getting. http://en.wikipedia.org/wiki/Fixed-point_arithmetic Though, I think this is what you are doing.. you are multiplying every number by 1,000,000 and storing that.. yes? If so.. this is fixed point. hooray! (forgive my sleepiness.. I've suggested you do something that you are already doing) Did you consider doing Fixed Point for this?

e.g. 100.24 would become 10024 or maybe 100240 in the db. You just decide how many digits to the right of the decimal you want to store… thus you avoid floating point errors. Then you just convert them when putting and getting.

http://en.wikipedia.org/wiki/Fixed-point_arithmetic

Though, I think this is what you are doing.. you are multiplying every number by 1,000,000 and storing that.. yes? If so.. this is fixed point. hooray! (forgive my sleepiness.. I’ve suggested you do something that you are already doing)

]]>