Efficient way to find length of integer in c++?

Question

Looking for an easy and efficient meathod to find length of an integer. The integer can be negative or positive. I cannot include any libraries.

Answer 1

This is an algorithm which I just came up with.
Please test and see if it works for all values.

https://code.sololearn.com/cv0xQoe9xit7/?ref=app

Answer 2

Do something like this

https://code.sololearn.com/c3iZdG7FcXqu/?ref=app

Answer 3

Divide by 10 until the answer is < 1? I haven't completely thought this through...

edit: yeah...negatives. Glad others popped in :)

Answer 4

@Little Grass

Though "-" is easily fixed, unfortunately to_string() is not in gcc (and it requires a lib).

Answer 5

to_string(a).size()