《c程序设计语言》里的一个翻译问题
今早读c程序设计语言，盯着一段话3遍都看不出到底见不检查enum，于是坑出了英文原版，不幸英文水平一般
发现这两个词有细微差异，但是新手还是看不懂，求解！！
Enumerations provide a convenient way to associate constant values with names, an alternative to #define with the advantage that the values can be generated for you. Although variables of enum types may be declared, compilers need not check that what you store in such a variable is a valid value for the enumeration. Nevertheless, enumeration variables offer the chance of checking and so are often better than #defines. In addition, a debugger may be able to print values of enumeration variables in their symbolic form. 
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