ceshi2.pl0

是用flex分析pl0源代码的程序

var m, n, r, q;

procedure gcd;
begin
    repeat
        q := m / n;
        r := m - q * n;
        m := n;
        n := r;
    until r = 0
end;

begin
    read(m);
    read(n);
    if m < n then
        begin
            r := m;
            m := n;
            n := r;
        end;

    begin
        call gcd;
        write(m);
    end;
end.