I have a working code (below) to convert a number to Excel-like (A...Z AA...AZ BA...BZ ...ZA-ZZ) column codes (headers).For simplicity I limited it to 1 or 2 character codes.Can the algorithm be streamlined by using a bit more of elementary math or using it differently?Please note that I just happened to need it in JavaScript (so I wrote it in JS) and am not looking for pure code improvements.function numberToLetters(nNum) {    var result;    if (nNum <= 26) {        result = letter(nNum);    } else {        var modulo = nNum % 26;        var quotient = Math.floor(nNum / 26);        if (modulo === 0) {            result = letter(quotient - 1) + letter(26);        } else {            result = letter(quotient) + letter(modulo);        }    }    return result;}function letter(nNum) {    var a = A.charCodeAt(0);    return String.fromCharCode(a + nNum - 1);}
Excel-like column numbering
javascript;algorithm;excel;number systems