Why am I getting this output?

Question

https://code.sololearn.com/cfnzCejflVzR/?ref=app
https://code.sololearn.com/cu7W7CnJaSEy/?ref=app

Answer 1

to be shure: an input of "1 abc" should output "bcd". Right ?

Answer 2

Code 1

line 18: i=0
19: j++
20: str[j]
20: alph[i]
21: alph[i+num]

And you should handle the case that i+num can be > alph.lenght.

Also right now the performance is really bad. You should rethink your algorithm.

Answer 3

You have a point, but now?

https://code.sololearn.com/cu7W7CnJaSEy/?ref=app

Why the following code doesn't work?
if(i+num>26){
code[j] = alph[(i+num)-26];
}