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发表于 2012-11-13 08:48:12
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1判断语句 j/ K% |7 J0 y! q" M. _) m2 q
if <condition> then% t' h( Y/ Q& h
<statement sequence1>;
' o4 l1 t1 ]2 M7 g0 D elseif <condition> then. B! V! C2 v" n% X! K1 }
<statement sequence2>;
+ _8 J- }$ e4 G5 k else
( f* p, u. n0 Q! r <statement sequence3>;
2 P0 n, K% g" y1 r end;: H" G5 Q$ z0 h* e" n
如果分支比较多,用:
0 D/ b6 M: g: w' y9 L( V3 m- E inspect <expression>
- Z% }5 u! R$ Y a$ G9 ^ when <constant_list> then
/ n/ e# h4 f# N( r <statement sequence1>;. l/ o1 O5 o/ e2 M
when <constant_list> then
; W; I, t* u; W/ S3 c <statement sequence2>;
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else
: v4 K) f0 {' K9 X7 f <statement sequence3>;
/ F/ b! m- K! L6 M4 u ] v1 Xend;
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7 E }. Q$ r+ Q# @2循环语句
' _9 R; A. O) S/ }0 Y (1) from <statement sequence1>
6 j: r# |7 F4 K* G" x! X until <condition> loop
0 _4 F6 Q4 _; S( ]/ E# B <statement sequence2>;' z: ~ H6 h$ `" I) w- f) @
end;
( f3 q. e# @" Y; q (2) while <condition> loop( f/ F& v0 ]( w
<statement sequence1>;
/ z+ M; F! R" K4 x2 Z5 Z end; Y! K; g& ?- }0 f! M% e2 O' @
(3) repeat / q1 B6 ^ `$ @9 w
<statement sequence1>;- H; ?/ L. K4 v) B: r0 M% L
until <condition>;
; g. p* L0 P0 F5 O (4) for <condition> to <condition> loop
( t, u' n" R+ A: w <statement sequence1>;
& B- p4 l& K2 @3 M0 p& z next; o/ v# M4 Y K
3中断语句( |# V6 Y' t) g1 c7 _% _( I
waituntil <condition> prio <integer expression>;& ~9 q* @) K' e
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以上为常用的函数!7 P, w8 ?. Z. y
还有很多,如有需要我把资料发到你邮箱里 * H& w! o" u( [) h( W! Y
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