IF/zh CN: what changed

Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.

Title: If/zh CN

New		Line
1	+	## If then（条件语句）
2	+
3	+	``` pascal
4	+	if condition
5	+	then statement1
6	+	else statement2;
7	+	```
8	+
9	+	Condition 是布尔表达式
10	+
11	+	如果 Condition 为真则执行 statement1，否则执行 statement2。
12	+
13	+	Else 和 statement2 可省略，此时如 Condition 为假则跳过 if 语句。
14	+
15	+	注意：1. else 之前不能加分号。下面是不合法的：
16	+
17	+	``` pascal
18	+	if condition
19	+	then statement1;
20	+	else statement2;
21	+	```
22	+
23	+	2.else 总是与和它最近的if配对：
24	+
25	+	``` pascal
26	+	if condition1
27	+	then if condition2 then statement1;
28	+	else statement2;
29	+	```
30	+
31	+	上面的else与第二个if配对；
32	+
33	+	要使else与第一个if配对，则应写成这样：
34	+
35	+	``` pascal
36	+	if condition
37	+	then begin
38	+	if condition2 then statement1;
39	+	end
40	+	else statement2;
41	+	```
42	+
43	+	### If语句中使用复合语句
44	+
45	+	If语句可以使用复合语句（[[Begin\|begin]] ... [[End\|end]] [[Block]]）。
46	+
47	+	``` pascal
48	+	if boolean_condition then
49	+	begin
50	+	statement1;
51	+	statement2;
52	+	statement3;
53	+	end;
54	+	```
55	+
56	+	---
57	+	From the Free Pascal wiki, page "If/zh CN", as it stood on 2020-02-17 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).