Increment in loops

Question

In my code,

https://code.sololearn.com/clbZtK23azsn/?ref=app

if(key >= 0 && key < 26)
{
for(int i = 0 ; i < mess.length() ; i++)
{
mess[i] = encrypt(mess[i], key);
cout << key << endl;
//key++;
}

If I have key++ in this loop, The code becomes wrong.
I am not able to understand what is the problem.

Answer 1

Mukul o ok i understand what you are talking about and your problem is a getline error. you use getline after you have used a normal cin>> doing this the getline is seeing the \n newline and puting that as mess[0] making c in code mess[1] and by that time if you use key++ c is using key 2 instead of 1. to fix this you just have to put
cin.ignore();
right before your getline and that will clear out the newline and fix the problem with key++. hope this helps.

Answer 2

The output is shifted wrong using key++.
For example, if I have to encrypt the word code by 1 shift without key++, the word would be dpef.
But when I put key++ It should be dqgi but it is erhj.

Answer 3

Thank you Mooaholic

Answer 4

i dont know much about Caesar Cipher myself but your code looks like it works correctly, and still runs if you put the key++. what is it doing wrong?