card shuffler

[neuro]

here's my take on it - it's not the fastest but it most closely simulates the act of shuffling a deck as it might be done by a professional type

Code:

int card[52], temp[52], i, shuffles, cutsplit, lefthand, righthand, whichhand;
for (i=0; i < 52; i++)
  card[i] = i; // reset the deck
for (shuffles=1; shuffles <= 7; shuffles++) // shuffle the deck 7 times
{
  for (i=0; i < 52; i++)
    temp[i] = card[i];
  cutsplit = rand() % 3 + 24; //  cut the deck, make it slightly uneven sometimes
  lefthand  = 0;
  righthand = cutsplit;
  whichhand = 1;
  for (i=0; i < 52; i++)
  {
    if (rand() % 3 == 0) whichhand = -whichhand; // the act of shuffling will typically alternate left to right but add a 33% randomizing factor.
    if      (whichhand == 1  && lefthand  >= cutsplit) whichhand = -whichhand; // if theres no card in the designated half, switch halves
    else if (whichhand == -1 && righthand >= 52)       whichhand = -whichhand;

    if      (whichhand == 1)  deck[i] = temp[lefthand++ ];
    else if (whichhand == -1) deck[i] = temp[righthand++];
    whichhand = -whichhand;
  }
}