Dear Python Developers,

I made a program that finds how many 0's at the end of the number

But when I enter number has 23 zero its okay but when I enter number has 24 zero its crash

Can i see the program code?

I shared but I write again.

sayac = 0
fakto = 10000000000000000000000
while True:
    if fakto % 10 == 0:
        sayac += 1
        fakto = fakto / 10
    elif fakto % 10 > 0:
        break
print(sayac)

Hi Talha, you are using floating points division which convert its operands to floats so it loose precision for large numbers. The syntax for integer division in Python 3 is // and it will not change the type of its operands. Notice the difference below:

>>> 100000000000000000000000000/10 % 10
4.0
>>> 100000000000000000000000000.0//10 % 10
4.0
>>> 100000000000000000000000000//10 % 10
0

As you can see, in the first example the operand got changed to float which caused a loss of precision and we get the same result when we try directly with a float. Using // gives the expected result.

Python use perfect arithmetic for integers but IEEE 754 for floating point calculations. You will find that there is a lot of those "quirks" when using either very large or very small numbers and will need to be mindful of them.

In the program you linked, changing '/' to '//' should gives the result you are expecting.

Closing issue since it is not a bug, at least a bug of python itself. Feel free to post any questions to python-list mailing list. https://mail.python.org/mailman/listinfo/python-list