test3.txt

PL/0语言编译器的实现

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