ex1.txt

“编译原理与技术”的上机实验要求你对PL/0语言及其编译器进行扩充和修改。每个扩充或修改方式可得到不同的分数

const m = 7, n = 85;
var x, y, z, q, r;

procedure multiply;
var a, b;
	procedure plus;
	var ss;
	    procedure plusplus;
		var s;
		begin
			s := ss;
		end;
	begin
		ss :=x
	end;

begin
	a := x; b := y; z := 0;
	while b > 0 do
	begin
		if odd b then z := z + a;
		a := 2 * a; b := b / 2;
	end
end;
begin
	x := n; y := m; call plusplus;
end.