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发表于 2013-5-15 18:03:34
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显示全部楼层
用FlowControl8 l3 y' p" c% W* A. R, m
8 L/ l( ^) S! r( B! I* N6 ]
大概是这样控制的:* Q% x- N& p% {' \" A
- Y7 X0 p. d6 A
if SP1.empty then, x9 r; e/ s3 }. o" T# a K
r:=1;
8 K" c B' i/ B- {; Velseif SP2.empty then9 t$ V ^- y9 S' D8 B+ _: d" o* L
r:=2;
! o1 F+ l/ S* Eelseif SP3.empty then
" ~8 a6 q) c- Y r:=3;7 y: A$ Y( p0 w0 ?4 K
else
" `# T9 z( H/ {+ Y$ w9 K0 b2 ^ r:=default_output;
* j, P, s. V6 u" o1 x/ F- H8 Aend;
# ?# m ]. k1 ?6 L
8 C8 M' p6 q ~" X' g9 h F8 Rreturn r; |
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