I can't seem to get my head around this 'simple' book example of
binary-to-decimal conversion, which goes from left to right:
B = '11011101'
I = 0
while B:
I = I * 2 + int(B[0])
B = B[1:]
print(I)
>>> 221
My thought was to go from right to left, multiplying digits by successive
powers of two, and adding, like so:
B = '11011101'
sum = 0
for exp, num in enumerate(reversed(B)):
sum += int(num) * 2**exp
print(sum)
>> 221
Both methods work but I just can't see how the first one does. Am I missing
something obvious here?
--
Jim
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