Last non-zero digit in factorial
Detailed guide and Python implementation for the 'Last non-zero digit in factorial' problem.
Problem Statement
Write a function last_non_zero_digit(n) that returns the last non-zero digit of n! (n factorial). For example, 5! = 120, and the last non-zero digit is 2. The function takes a non-negative integer n and returns a single digit (1-9).
- •0 <= n <= 1000
Examples
n = 5
2
5! = 120. Ignoring trailing zeros, the last non-zero digit is 2.
n = 10
8
10! = 3628800. The last non-zero digit is 8.
n = 1
1
1! = 1. The last non-zero digit is 1.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
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