tessst

   // find frequency only for A ..
    int freq;

    if (noteLetter == "A") {
        if (hasAccidental == true) {

        } else { //doesn't haven't accidental for all following code!
            if (octave == 4){
                freq = 440;
            } else {
                int semitoneDiff = octave - 4;
                int multiplier = powf((double) 2, (double)semitoneDiff);
                freq = 440 * multiplier;
            }
        }
    } else {

    }