+ 3

# True of False

Why is this False: a = 3**45 == int(float(3**45)) print(a) When this is True: a = 3**3 == int(float(3**3)) print(a) I don't understand this logic.

4 Answers

+ 3

It is linked to something called limited floating point accuracy or precision:
https://en.m.wikipedia.org/wiki/Floating-point_arithmetic#Accuracy_problems
Basically, floats in their decimal state have to be represented by binary system (deep, deep down in the "computer core" :)
This causes problems for all numbers which cannot be precisely represented using powers of 2 - so basically most real numbers.
float(3) is represented by a number closest to its representation (it might be something like 3.000000000000000004) which for "small" computations makes no difference, but for large operations likes exponentiation, the inaccuracy might result in a bit different, unexpectedly different, number.
Please note that for numbers which are exactly the power of 2, this does not happen.
4.0**100 == 4**100

+ 1

Try printing this
print(int(float(3**34)))
print(3**34)

+ 1

It only started changing at 3**34.
Higher level (or lower level) SoloLearners who always gets this question right in the challenge section, come and explain it o!!!

0

Abhay I still do not understand.
Have you tried this:
print(int(float(3**33)))
print(3**33)
Does it mean for larger exponentials, it changes or something?