Pset2 Vigenere integer to pointer conversation

am working on this problem for 2 days. i just don't know how else to write it to avoid "incompatible integer to pointer conversion initializing...". i know that the problem is made by mixing ints and strings but i don't know how else to write it. i read most of the how conversing ints to chars works and all but i just don't know how else to implement the key word. if someone can help i would really appreciate it. thanks

(Code removed to comply with academic honesty)

`````` string Final = (((UI[i] - 'A') + tolower(key[a % keyl]) - 'a') % 26) + 'A';
``````

It is an incorrect assignment:

``````(((UI[i] - 'A') + tolower(key[a % keyl]) - 'a') % 26) + 'A';
``````

The above line is an integer, but string Final, expects a string, is a non-assignable expression, you must do

``````int Final = .....
``````

You do not worry it's an integer because when we use printf it will become a character, if we use the appropriate conversion: You can check this by printing the following

``````printf("97 = %c\n", 97);
``````

and you'll get that 97 = a.

EDIT i just don't know how else to write it to avoid "incompatible integer to pointer conversion initializing...".

What do you expect to happen when the next loop is executed?

``````for (int i = 0, j = strlen(key); i < j; i ++)
{
if (!isalpha(key[i]))
printf("Key needs to be all letters. Please try again.\n");
return 1;
}
``````

I'll tell you, the program ends immediately

EDIT 2

the correct way is

``````for (int i = 0, j = strlen(key); i < j; i ++)
{
if (!isalpha(key[i]))
{
printf("Key needs to be all letters. Please try again.\n");
return 1;
}
}
``````
• no, program terminates instantly if i try to put it as int. also if i write it all like printf("c", and than the expression) program just terminates. so there is more to figure there :S Aug 26 '16 at 19:40
• you can read my edit
– MARS
Aug 26 '16 at 20:12
• i thought that loop goes through each character of KEY end terminates if there is non letter character. thats not how it works? what do you see it does? EDIT: wow that thing was killing my program when i tried with int instead of string. can you tell me why that loop does not work as i imagine it should? thank you Aug 26 '16 at 20:36
• you can read my edit 2
– MARS
Aug 26 '16 at 20:42