Selection Method

Code:

void crossover(int mum, int dad)
{
  int mumfirst, mumlast, dadfirst, dadlast;
  struct prog *mump = &population[mum];
  struct prog *dadp = &population[dad];
  int worst1, worst2;

  do worst1 = select_worst();
  while (worst1 == mum || worst1 == dad || worst1 == best_prog);

  do worst2 = select_worst();
  while (worst2 == mum || worst2 == dad || worst2 == worst1 ||
         worst2 == best_prog);

  mumfirst = find_first(mump);
  mumlast  = subtree_end(mump->code, mumfirst);
  dadfirst = find_first(dadp);
  dadlast  = subtree_end(dadp->code, dadfirst);

  create_child(worst1, mump, mumfirst, mumlast, dadp, dadfirst, dadlast);
  if (!correct)
     create_child(worst2, dadp, dadfirst, dadlast, mump, mumfirst, mumlast);

}

hi everybody, this is a script to select direction for an object

Any body have any idea, how can i improve the program?
thanks

That's not a program, it's a function. Without definitions of struct prog and the myriad functions you are calling, it's nearly impossible to comment.