How to do float to integer conversion in python?

Question

Code:

X=3.999999
Y=int(X)
Print(Y)

Output:
3

Code:

X=3.9999999999999999
Y=int(X)
Print(Y)

Output:
4

What is the theory behind this two codes?
And how to understand the logic of this?

Answer 1

This will be happen because of the bit-wise representation of dezimal places. To avoid this issue, you should use the math.floor() function (or math.ceil()). Like this :

import math

varFloat = 47.11
print(varFloat) # -> 47.11

varInt = math.ceil(varFloat)
print(varInt) # -> 48

varInt = math.floor(varFloat)
print(varInt) # -> 47