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发表于 2012-11-13 08:48:12
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显示全部楼层
1判断语句4 y/ D& \3 {& V: _& m& z4 e; y
if <condition> then
& e' K& V! }" E, R8 C4 y <statement sequence1>;
8 F* ~1 M4 t* Q; W8 l, d elseif <condition> then# J) N' v; R9 f& V, G& t/ O' j. L
<statement sequence2>;
8 ] O& ]$ @! g. i+ o5 t3 c else
9 u+ e' P" B) x, w9 G k- N1 E! g! T <statement sequence3>;3 q: r( s0 V5 w8 G% ~: d, \
end;1 m7 p" p3 E; _
如果分支比较多，用：
( t D7 q" g6 W. [" x inspect <expression>. {) m. R: m4 |" }' u
when <constant_list> then. f1 p9 S. y' Y0 q, P. l
<statement sequence1>;1 p) U. u8 t$ \ Z) `1 g
when <constant_list> then
, C+ X. f6 M5 H" o0 a( ] <statement sequence2>;/ @$ A! |- e9 i; u) U
...+ b+ }' i" V/ o7 j
else
" U ~# L7 k/ i, ?9 Y( W <statement sequence3>;) \7 a6 t/ e2 O3 g s
end;
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$ y, r3 A+ E! W% V2循环语句
3 H- \3 \/ C6 b2 H (1) from <statement sequence1>9 h+ k* O5 _3 f( X
until <condition> loop
' I8 T( Y. V v <statement sequence2>;
+ a8 i d9 V! B+ p+ L% ] end;+ L$ N) V* r! ~
(2) while <condition> loop, r3 I8 [$ l( E3 s. e1 H
<statement sequence1>;
, Q7 Q/ v+ Q9 P7 g end;
+ n9 p/ E* J( M. a: |! L (3) repeat 0 x" I ]7 |% `5 R% _
<statement sequence1>;% D6 ?- r& K( [; d" w, r+ E- [
until <condition>;0 {, C. H7 M5 W p& p a
(4) for <condition> to <condition> loop
) Q* @* F2 J( Z. ` <statement sequence1>;
+ }8 P- W9 O( Z7 P% u next;% x. ~# T* g4 i1 a, ]
3中断语句
& l9 c& _1 n+ v0 H& f waituntil <condition> prio <integer expression>;
" g) ?& f; _ U% @9 F/ [) y! p/ U
3 R0 q* ^7 ?6 \- z( k# G以上为常用的函数！, M0 D6 T) ]/ F- I0 i' S5 l* {% C
还有很多，如有需要我把资料发到你邮箱里 z5 T; {! X7 J3 Y0 k& p/ ^
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