Something like this:

using namespace std;
// the function below takes an integer and outputs a corresponding letter
void convert (int num) 
int main
   int num;
   cout << "Enter an integer" << endl;
   cin >> num;
   convert (num); 
   return 0;

Input: 0 , Output: "A''
Input: 1 , Output: "B''
Input: 25 , Output: "Z''
Input: 26 , Output: "A'' (repeats the alphabet again)
Input: 2033, Output: ''F''

I've thought of using a switch in the function convert but of course there are too many integers ):
So what approach can I use? I'd rather not use arrays I haven't learnt them yet.

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Take advantage of the fact that characters are represented by integer values on your computer, and therefore may be added to other integer types.

char convert(int i)
    return (i%26) + 'A';

EDIT: Note - This depends on the character set on your computer having the letters 'A'..'Z' as a contiguous set. As far as I am aware, most character sets do (such as ASCII), but there is always a possibility that some obscure character set somewhere in the world doesn't.

EDIT2: For the more portable solution using the <string> library

char convert(int i)
    return i % s.size() );

See EBCDIC for an example of a character set that doesn't have consecutive A..Z.

Ah ok thanks very much for that. First I thought adding an integer to "A" wasn't possible but then I saw that only single quotation marks were used. So initializing any variable of type char requires single quotation marks? I'm sorry as I've only used numbers before.

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