今天把变量名部分看完了，变量命名，以后要按一定规则了，虽然麻烦一点，但是以后会方便很多。

顺便贴一下书中总结的要点：（书是中文的，不过电子版我只找到英文的，就贴英文的好了）

Checklist: Naming Variables

General Naming Considerations

• Does the name fully and accurately describe what the variable represents?

• Does the name refer to the real-world problem rather than to the programming-language solution?

• Is the name long enough that you don’t have to puzzle it out?

• Are computed-value qualifiers, if any, at the end of the name?

• Does the name use Count or Index instead of Num?

Naming Specific Kinds of Data

• Are loop index names meaningful (something other than i, j, or k if the loop is more than one or two lines long or is nested)?

• Have all "temporary" variables been renamed to something more meaningful?

• Are boolean variables named so that their meanings when they’re true are clear?

• Do enumerated-type names include a prefix or suffix that indicates the category—for example, Color_ for Color_Red, Color_Green, Color_Blue, and so on?

• Are named constants named for the abstract entities they represent rather than the numbers they refer to?

Naming Conventions

• Does the convention distinguish among local, class, and global data?

• Does the convention distinguish among type names, named constants, enumerated types, and variables?

• Does the convention identify input-only parameters to routines in languages that don’t enforce them?

• Is the convention as compatible as possible with standard conventions for the language?

• Are names formatted for readability?

Short Names

• Does the code use long names (unless it’s necessary to use short ones)?

• Does the code avoid abbreviations that save only one character?

• Are all words abbreviated consistently?

• Are the names pronounceable?

• Are names that could be misread or mispronounced avoided?

• Are short names documented in translation tables?

Common Naming Problems: Have You Avoided…

• …names that are misleading?

• …names with similar meanings?

• …names that are different by only one or two characters?

• …names that sound similar?

• …names that use numerals?

• …names intentionally misspelled to make them shorter?

• …names that are commonly misspelled in English?

• …names that conflict with standard library routine names or with predefined variable names?

• …totally arbitrary names?

• …hard-to-read characters?

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