Go4Expert - help modifying code

I have a program evaluating a straight hand in poker: Here is my code:

Code:

int numInRank[14];



cin.get(rankCh);

    switch (toupper(rankCh))

     {

      case '-1':            exit(0);

      case '?':           rank = 0; break;

      case 'A':          rank = 1; break;

      case '2':           rank = 2; break;

      case '3':           rank = 3; break;

      case '4':           rank = 4; break;

      case '5':           rank = 5; break;

      case '6':           rank = 6; break;

      case '7':           rank = 7; break;

      case '8':           rank = 8; break;

      case '9':           rank = 9; break;

      case 'T':           rank = 10; break;

      case 'J':           rank = 11; break;

      case 'Q':          rank = 12; break;

      case 'K':          rank = 13; break;



bool isStraight(int numInRank[]){

    int count = 0;

    for(int i = 1; i  < 14; i++){

        if(numInRank[i] != 0){

            count++;

            if(i == 13 && numInRank[1] != 0) count++;

        }else{

            count = 0;

        }

        if(count == 5) return true;

    }

    return false;

}

I would like to modify the above code to handle A high and A low straights- I sized my array to 14 instead of 13 to hold both...
Any suggestions...