|
发表于 2013-5-15 18:03:34
|
显示全部楼层
用FlowControl
4 X H. v1 ^! q
$ E7 d+ K6 O# X9 k+ n+ o2 H大概是这样控制的:. g# @& [( ]2 I, L
: T2 z1 v- X6 G2 h% k6 _9 O) X3 q0 X
if SP1.empty then
$ m( R$ u1 s$ E2 c+ }( l r:=1;
& y7 U# a/ S+ b9 \6 s. pelseif SP2.empty then4 e( k2 E% R3 D, D
r:=2;
/ l/ b6 Z% S& M/ q& \- ]% y- e3 M5 B7 V& felseif SP3.empty then
4 ^9 f/ W2 B8 M# t r:=3;. H, x r H) i( s# C
else
8 x7 A0 s' d# G! } r:=default_output;
$ K7 R/ V) W( u* _3 J# f# e, ~2 Kend;
2 P* m2 |1 V7 X# {+ F2 ~# h0 C& X2 @2 b- F5 n" {9 p% P( q
return r; |
|