while.txt

编译原理课程设计,清华大学版教材的pl0编译器的源码.

const a=10;
var b,c;
procedure p;
  var d;
  begin
    c:=b+a
  end;
begin
  read(b);
  while b#0 do
    begin
      call p; write(2*c); read(b)
    end
end.