Finding straight draws in poker

[n1mda]

Moderator note: This thread was moved as it was an inapproprioate reply that resurrected Finding a 'straight' in poker.

I'm reviving this thread as I'm in the process of trying to find straights and straight draws on a board.

The latest code in this thread works great if I want to find a straight in any way, but what I really want to find is straight draws. Both inside and outside straightdraws.
Eg. a board consisting of: "2h3c4h" is a straightdraw, and this obviously I can find. But if the board looks like: "2h4c5h" (an inside straightdraw) I'm not sure how to handle it.

My mind is blank and I can not seem to come up with a solution.
Anyone who has any ideas?

/* straight.c */

#define MAXN        13
#define CARDSINHAND  7
#define IN_A_ROW     5

int is_straight( int* cards, int ncards ) {

    int seen[ MAXN ];
    int in_a_row;
    int i;

    for (i = 0; i < MAXN; i++) seen[ i ] = 0;    /* zero "seen" array */

    for (i = 0; i < ncards; i++)                 /* set values seen to non-zero */
        seen[ cards[ i ] - 1 ]++;

    in_a_row = 0;                                /* see if there are IN_A_ROW in a row */
    for (i = 0; i < MAXN; i++) {
        if (seen[ i ]) {
            if (++in_a_row >= IN_A_ROW)
                return 1;
        }
        else
            in_a_row = 0;
    }
    return 0;
}

int main() {
    int c[] = { 4, 6, 3, 5, 7, 9, 11 };
    int d[] = { 4, 6, 2, 5, 7, 9, 11 };
    printf( "c: " );
    printf( is_straight( c, CARDSINHAND ) ? "yes" : "no" );
    printf( "\nd: " );
    printf( is_straight( d, CARDSINHAND ) ? "yes" : "no" );
    printf( "\n" );
}

[Adak]

If you loop through the hand, from low card - 1 to high card + 1, and assign a temporary card to the looping temp card value, and put it into the hand, you will find the "straight draw", possibilities.

Look up tables are faster, but poker is not a game of blinding speed.