Why 4.300000000001

Question

i = 1.0
while i <= 12.0:
print(i)
i = i + 1.1

Answer 1

everything in the machine is stored in binary system for example
x=5
will be 101
but some decimal numbers cannot be converted to binary system so it rounds it to the closest number

Answer 2

Because floating-point numbers are inaccurate and certain numbers can't be represented accurately.

See the following two resources for info:
https://stackoverflow.com/questions/21895756/why-are-floating-point-numbers-inaccurate

https://effbot.org/pyfaq/why-are-floating-point-calculations-so-inaccurate.htm

Answer 3

When you use double and you add this multiple times it also has a little more than what you gave then it doesn't add 1.1 but 1.1000000000000001(just example)