Basic Pascal Tutorial/Chapter 4/Forward Referencing/zh CN: what changed

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

Title: Basic Pascal Tutorial/Chapter 4/Forward Referencing/zh CN

New		Line
1	+	4F - 前向引用 (原作者: Tao Yue, 状态: 未更改)
2	+
3	+	这些虽然容易理解，但有时也让人困惑。
4	+
5	+	程序中只能使用已经定义的过程/函数？或许是这样吧，先定义后使用。
6	+
7	+	不过，也有例外，你想先使用后定义？要解决这类问题，你需要使用前向引用。(在预先声明的过程/函数后加forward)
8	+
9	+	如：
10	+
11	+	``` pascal
12	+	procedure Later (参数列表); forward;
13	+
14	+	procedure Sooner (参数列表);
15	+	begin
16	+	...
17	+	Later (参数列表);
18	+	end;
19	+	...
20	+	procedure Later;
21	+	begin
22	+	...
23	+	Sooner (参数列表);
24	+	end;
25	+	```
26	+
27	+	示例：
28	+
29	+	``` pascal
30	+	program q;
31	+
32	+	procedure a;forward;
33	+
34	+	procedure b;
35	+	begin
36	+	writeln('B调取A：');
37	+	a;
38	+	end;
39	+
40	+	procedure a;
41	+	begin
42	+	writeln('A过程.');
43	+	end;
44	+
45	+	begin
46	+	b;
47	+	end.
48	+	```
49	+
50	+	### 相关
51	+
52	+	[维基百科前向声明](https://zh.wikipedia.org/wiki/%E5%89%8D%E5%90%91%E5%A3%B0%E6%98%8E)
53	+
54	+	\| \| \| \|
55	+	\|----\|----\|----\|
56	+	\| [[Basic Pascal Tutorial/Chapter 4/Recursion/zh CN\|上一页]] \| [[Basic Pascal Tutorial/Contents/zh CN\|目录]] \| [[Basic Pascal Tutorial/Chapter 4/Programming Assignment/zh CN\|下一页]] \|
57	+
58	+	---
59	+	From the Free Pascal wiki, page "Basic Pascal Tutorial/Chapter 4/Forward Referencing/zh CN", as it stood on 2022-08-20 after a change by Kai Burghardt, 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).

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