label_of_subroutine:
  # prologue of subroutine
  pushl %ebp # saves the old value of the EBP
  movl  %esp,%ebp # freeze ebp so it is pointing
                  # to a fixed point
  addl  $offset_to_first_localvar,%esp
                  # reserves space on the stack
                  # for local variables
                  
  .... # code of the subroutine
  
  # epilogue of subroutine
  movl  %ebp,%esp
  popl  %ebp # restore the ebp
  ret
  
  
Mastermind scoring logic:

each color is represented by an integer value
0-5 for 6 colors
each element in the array represents a peg

int original[4]
int guess[4]

int black = 0
int white = 0

# look for # of black pegs first
for (i = 0; i < 4; ++i)
  if original[i] == guess[i] then
    ++black
    original[i] = -1
    guess[i] = -2
  end if
end for

# count the # of white pegs
for (i = 0; i < 4; ++i)
  for (j = 0; j < 4; ++j)
    if (i <> j) and (original[i] == guess[j]) then
      ++white
      original[i] = -1
      guess[j] = -2
    end if
  end for
end for

struct Trial
{
  int guess[4]
  int black
  int white
};

void print10(unsigned int x)
{
  char ch;
  
  ch = (x % 10) + '0';
  if (x / 10 > 0)
  {
    print10(x / 10);
  }
  write(1, &ch, 1);
}