How come the answer to the code below is different from the actual math?

Question

Code:

print((456/10**2)*(10**2))

Using python the out put is equal (455.99999999999994)

But using the actual math it should be exactly (456)

Please guys can you explain why their is a difference

Answer 1

Hi, No One ! There’s a lot to read about this on the web. Try for example to start with this link:

https://www.geeksforgeeks.org/floating-point-error-in-JUMP_LINK__&&__python__&&__JUMP_LINK/amp/

Answer 2

Hi, againNo One !

print(int(456/10**2) * (10**2))

This is :
= int(4.56) * 100
= 4 * 100
= 400

Answer 3

Thank you

But I also have another question which is when I tried to change it to integer like this:-

print(int(456/10**2)*(10**2))

It outputs only 400 but why not 456 or 455 after all they are also integer like 400

Answer 4

Python performs calculations in binary system. Try dividing in binary and convert to decimal.

Answer 5

Thank you 😊