Re: Odd [math] behaviour
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 52772
interpreted = N
texte = WebDna @ wrote: > Can I ask what exactly is wrong with using the [format]? It returned the > answer he wanted. it has always returned the correct answer dealing with > math in the cart adding cost. > I'm sorry, you're right. The docs say [format] will round to the number of decimal places requested (when used with the 'f'). For some reason, I thought it would truncate. The C library sprintf("%.2f",var) is supposed to round, though some libraries don't do it correctly. I always try to do my currency math using integer number of pennies and display a decimal place during output. I even wrote a Perl module which does this, because this is the only 100% accurate way to perform math with currency values. John -- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748 ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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Associated Messages, from the most recent to the oldest:
WebDna @ wrote: > Can I ask what exactly is wrong with using the [format]? It returned the > answer he wanted. it has always returned the correct answer dealing with > math in the cart adding cost. > I'm sorry, you're right. The docs say [format] will round to the number of decimal places requested (when used with the 'f'). For some reason, I thought it would truncate. The C library sprintf("%.2f",var) is supposed to round, though some libraries don't do it correctly. I always try to do my currency math using integer number of pennies and display a decimal place during output. I even wrote a Perl module which does this, because this is the only 100% accurate way to perform math with currency values. John -- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748 ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
John Peacock
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