I accidentally sent as HTML so this is a resend in case that choked
the mailing prog ;')
I was doing a simple training prog to figure monetary change, and
wanted to avoid computer inaccuracy by using only two-decimal input
and not using division or mod where it would cause error. Yet, on a
simple subtraction I got a decimal error instead of a two decimal
result, as per below. What gives?
cost = float(input('How much did the item cost?: '))
paid = float(input('How much did the customer give you?: '))
change = paid - cost
#using 22.89 as cost and 248.76 as paid
twenties = int(change / 20)
if twenties != 0:
twentiesAmount = 20 * twenties
change = change - twentiesAmount
#change is 5.8700000000000045, not 5.87 - how did I get this decimal
error when simply subtracting an integer from what should be a
#two-decimal amount?
print(twenties, ' twenties')
print(change)
#and so forth for the rest of the prog
Jim Mooney
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
