Challange :identify the minimum number of bits required to represent a number?

Question

ex: input:5
output :3
input 4
output:3

Answer 1

はい (￣▽￣)ノ

https://code.sololearn.com/WbkRsXE1ybj4/?ref=app

Answer 2

JavaScript:

alert((prompt("") - 0).toString(2).length);

Answer 3

My try:
https://code.sololearn.com/cb6MsXg6HIDK/?ref=app

Answer 4

And Python:

print(int(input()).bit_length())

:^)