My first challange.

Question

Wap to find a number(entered by user) if the numbers is a valid bn number or not.
A valid bn number is a 10 digit number whose sum of digits +digit*it's position is divisible by 11
e.g
0201103311 is a valid bn number
working: 10*0+9*2+8*0+7*1+6*1+5*0+4*3+2*1+1*1=55
and 55 is divisible by 11
and bn numbers cannot contain any letters or special characters.
e.g
112113114x
so it is not a valid bn number because is contains a letter
BEST OF LUCK!!

Answer 1

Here we go

https://code.sololearn.com/cdtipd4K19G6/?ref=app

Answer 2

https://code.sololearn.com/chvSJKdPox7j/?ref=app