Difference between int(r/2) and r//2 outputs

Question

I was making an integer to Boolean program and was dealing with some large numbers The test case was - 15921396743627894741911

When I used

r/2 the output was 7.960698371813948e+21

int(r/2) gave me 7960698371813947736064

and r//2 gave me 7960698371813947370955

Why is the value for the last two cases so vastly different. Thank you

https://0.30000000000000004.com/ -- but also there's some more subtle stuff happening -- I believe this is a duplicate target though? https://stackoverflow.com/q/53891566/812183 — anthony sottile, Jan 08 '20 at 05:47

score 0 · Accepted Answer · answered Jan 08 '20 at 05:51

0

In Python 3, / does "true division", which returns a float, but floats have limited precision.

answered Jan 08 '20 at 05:51

wjandrea

1 Answers1