count number of 1's
given a number you have to find number of 1's in its binary form.
ex:-5 = 101
output:-2
ex:-5 = 101
output:-2
Given an integer n, write a function that returns count of trailing zeroes in n!. Examples: Input: n = 5 Output: 1 Factorial of 5 is 20 which has one trailing 0. Input: n = 20 Output: 4 Factorial of 20 is 2432902008176640000 which has 4 trailing zeroes. Input: n = 100 Output: 24
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