Counting the Number of Digits in an Integer

In Python, integers do not have an intrinsic concept of length. However, if you need to determine the number of digits in an integer, there are a few approaches you can consider.

Convert to a String

One simple method is to convert the integer into a string and then count the length of the resulting string. For example:

length = len(str(123))

This approach is straightforward but requires the intermediate step of converting the integer to a string.

Using Logarithms

Another option is to utilize the logarithmic function. The logarithm of a positive number base 10 indicates the number of digits in that number. For example:

import math
length = int(math.log10(123))   1

Iterative Removal

You can also iteratively remove the last digit of the integer until it becomes zero. Keep track of the number of iterations to determine the digit length:

length = 0
number = 123
while number > 0:
    number //= 10
    length  = 1