Hi,

during a boring telephone conference I typed this in notepad - so it is neither tested nor compiled, but the principle should work.

Code:
var different_letters(char* s)
{
  var letterflag[256];
  var count = 0;
  var i,l;
  l=str_len(s);
  for (i=0;i<l;i++) {letterflag[i]=TRUE};
  for (i=0;i<l;i++)
  {
    if (letterflag[(integer)(s[i])])
      count++;
    else
      letterflag[(integer)(s[i])]=FALSE;
  }
  return (count);
}


Asteroids 3D Collector Homepage