Issue with Python modulo [duplicate]

Question

def height(cent):
    height= {}
    height["feet"]= int(cent/30.48)
    height["inch"]= int(cent%30.48)/2.54
    print (height)
height (182.88)
print (182.88/30.48)
print (182.88%30.48)

The output is: {'inch': 11, 'feet': 6}

6.0

30.479999999999993

Why does 182.88%30.48 not equal zero?

Why are you expecting it to be? 182.88 / 30.48 is 6.033, not 6 exactly. — chepner
– chepner, Commented Oct 6, 2017 at 22:08
Do as little floating-point math as possible. Compute h = int(cent / 2.54), then use integer arithmetic to compute feet, inches = divmod(h, 12). — chepner
– chepner, Commented Oct 6, 2017 at 22:12

Kevin K. · Accepted Answer · 2017-10-06 22:11:30Z

1

Because the value of 30.48 is really 30.4799.. This is because of the way that floating point numbers are stored in python. So when you are dividing 30.479999 by 182.88, the resulting rounded integer is 5 (i.e. 182.88 // 30.48 == 5). So the remainder is 30.47999...

answered Oct 6, 2017 at 22:11

Kevin K.

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