I want help

Question

It have to plus digit of a number
But it has no output
What’s the problem?!
https://code.sololearn.com/cN8OTV2dMv8j/?ref=app

Answer 1

Just a quick fix:

https://code.sololearn.com/c0PC1uEvj2r8/?ref=app

Answer 2

You make endless while loop in f function.
n not changed, loop condition always true for n>100