Trailing Zeros
Learn to write the code for counting the number of trailing zeros at the end of a factorial.
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Challenge
Write a function called countTrailingZeros (int X) that determines the number of trailing zeros at the end of X! (X factorial), where X is an arbitrary input from the user.
Note: In case of a negative number X, your program should return -1.
Example 1
Input: 12
12! = 479001600
Number of zeros at the end of 12! = 2
Example 2
Input: 5
5! = 120
Number of zeros at the end of 5! = 1 ...