Basic Pascal Tutorial/Chapter 1/Identifiers/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 1/Identifiers/zh CN
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| 1 | + | 1B - 标识符 (原作者: Tao Yue, 状态: 已更改) | |
| 2 | + | ||
| 3 | + | 标识符是一些名字，用于引用存储的值，例如变量和常量。同样，每个程序都必须被一个标识符标识（明白？）。 | |
| 4 | + | ||
| 5 | + | 标识符命名的规则： | |
| 6 | + | ||
| 7 | + | - 必须以一个英文字母或者下划线（_）开始。 | |
| 8 | + | - 后面可以是英文字母，数字或者下划线（_）. | |
| 9 | + | - 不能含有如下特殊字符： | |
| 10 | + | ||
| 11 | + | `` ~ ! @ # $ % ^ & * ( ) + ` - = { } [ ] : " ; ' < > ? , . / | \ `` | |
| 12 | + | ||
| 13 | + | # 保留字 | |
| 14 | + | ||
| 15 | + | 有几个标识符是被Pascal已经占用的，你不能将他们用作你自定义的标识符。 根据[FPC参考](http://lazarus-ccr.sourceforge.net/fpcdoc/ref/ref.html)，他们分为如下三类： | |
| 16 | + | ||
| 17 | + | - Turbo Pascal保留字 | |
| 18 | + | - Delphi 保留字 | |
| 19 | + | - FPC 保留字 | |
| 20 | + | ||
| 21 | + | ### Turbo Pascal保留字 | |
| 22 | + | ||
| 23 | + | | | | | | | | | | | |
| 24 | + | |----|----|----|----|----|----|----|----| | |
| 25 | + | | absolute | and | array | asm | begin | break | case | const | | |
| 26 | + | | constructor | continue | destructor | div | do | downto | else | end | | |
| 27 | + | | file | for | function | goto | if | implementation | in | inherited | | |
| 28 | + | | inline | interface | label | mod | nil | not | object | of | | |
| 29 | + | | on | operator | or | packed | procedure | program | record | reintroduce | | |
| 30 | + | | repeat | self | set | shl | shr | string | then | to | | |
| 31 | + | | type | unit | until | uses | var | while | with | xor | | |
| 32 | + | ||
| 33 | + | ### Delphi 保留字 | |
| 34 | + | ||
| 35 | + | Delphi（II）保留字跟Turbo Pascal一样，但是增加了如下内容： | |
| 36 | + | ||
| 37 | + | | | | | | | | | | |
| 38 | + | |-----|---------|--------|----------|--------------|-----------|----------------| | |
| 39 | + | | as | class | except | exports | finalization | finally | initialization | | |
| 40 | + | | is | library | on | property | raise | threadvar | try | | |
| 41 | + | ||
| 42 | + | ### Free Pascal 保留字 | |
| 43 | + | ||
| 44 | + | 除了拥有Turbo Pascal和Delphi的保留字之外，Free Pascal还增加了下面的保留字： | |
| 45 | + | ||
| 46 | + | | | | | | | | |
| 47 | + | |---------|------|-------|-----|------| | |
| 48 | + | | dispose | exit | false | new | true | | |
| 49 | + | ||
| 50 | + | 另外，Pascal有几个预先定义的标识符。你可以用你自己的定义来覆盖他们，但这样做你就没法使用这些标识符在Pascal中原来所具有的功能了。 | |
| 51 | + | ||
| 52 | + | | | | | | | | | | | |
| 53 | + | |-------|-------------|---------|---------|------|---------|--------|------| | |
| 54 | + | | abs | arctan | boolean | char | cos | dispose | eof | eoln | | |
| 55 | + | | exp | false | input | integer | ln | maxint | new | odd | | |
| 56 | + | | ord | output | pack | page | pred | read | readln | real | | |
| 57 | + | | reset | rewrite | round | sin | sqr | sqrt | succ | text | | |
| 58 | + | | true | trunc write | writeln | | | | | | | |
| 59 | + | ||
| 60 | + | Pascal是不区分大小写的！MyProgram，MYPROGRAM和mYpRoGrAm这三者是完全相同的。但为了可读性考虑，最好有意义地使用大小写！ | |
| 61 | + | ||
| 62 | + | 标识符长度可以是任意的，但是许多Pascal编译器实际上只看开头的大约32个字符。也就是说，下面两个标识符： | |
| 63 | + | ||
| 64 | + | ` ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFAlphaBeta`\ | |
| 65 | + | ` ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGammaDelta` | |
| 66 | + | ||
| 67 | + | 可能对于某些编译器来说它们两者是相同的，因为第一个不同之处出现在第33个字符。 | |
| 68 | + | ||
| 69 | + | 为了让你的代码兼容所有的编译器，使用合理长度的标识符——最多15个字符。这样，你打字的时候也省事。 | |
| 70 | + | ||
| 71 | + | | | | | | |
| 72 | + | |----|----|----| | |
| 73 | + | | [[Basic Pascal Tutorial/Chapter 1/Program Structure/zh CN|上一页]] | [[Basic Pascal Tutorial/Contents/zh CN|目录]] | [[Basic Pascal Tutorial/Chapter 1/Constants/zh CN|下一页]] | | |
| 74 | + | ||
| 75 | + | --- | |
| 76 | + | *From the Free Pascal wiki, page "Basic Pascal Tutorial/Chapter 1/Identifiers/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).* | |
| 77 | + | Category: zh |