program1.txt

编译原理课程设计大作业PL0文法简易编译器

const z=0;
var head,foot,cock,rabbit,n:integer;
begin
  n:=z;
  read(head,foot);
  cock:=1;
  cock:=cock+1;

  for cock:= 1 downto 1 do
    begin
        writeln(0)
    end;
	
  cock:=1;
  while cock<=head do 
  begin 
    rabbit:=head-cock;
    if cock*2+rabbit*4=foot then
    begin
      write(cock,rabbit);
      n:=n+1
    end;
    cock:=cock+1;
  end;
  if n=0 then write(0,0)
end.