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How would I combine them into a single function?

I am trying to finish this project and my decrypt does not work.
Key should be an array and should be updated at each character.



#include <stdio.h>
#include<string.h>
#include<ctype.h>...

hello, I'm trying to put in my code to check if non ASCII character is a valid input if not get an error message.



#include <stdio.h>
#include<string.h>
#include<stdlib.h>
#include<ctype.h>...

Is this how an autokey cipher would work or is there an easier way.

I am trying to put this algorithm into code for my autokey cipher program.

If (keyIsNotExhaust) Encryption = currChar + key; else Encryption = currChar + prevChar;

If (keyIsNotExhaust)...

If (keyIsNotExhaust) Encryption = currChar + key; else Encryption = currChar + prevChar;

If (keyIsNotExhaust) decryption = currChar - key; else decryption = currChar - decryption;

Return...

ok, what about my logic of how autokeycipher works. Is this how it would happen to encrypt and decrypt?

It is an array so I’m trying to input that all though out my code

Hello,
Can somebody please help me with this code. I've gotten somewhat an idea of what it can be but it is still giving me errors. I also don't understand the algorithm of an autokey cipher so...