blocks|key|5227936|text|enum只是赋予常量符号值的一种方式；常量只是整数，与定义相比，它有几个优点:如果是连续的，则自动创建值，而enum则服从块作用域。它还告诉其他程序员，除了变量之外，您只接受这些值。调试器可以显示符号名，这可能会有所帮助，而不仅仅是显示原始值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5227937|entityMap^0|0|4|1I|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

An <code>enum</code> is just a way of giving constants symbolic values; the constants are just integers' There are a couple of advantages to this, compared to defines: The values, if consecutive, are automatically created, and an <code>enum</code> obeys block scope. It also tells other programmers that you except the variable to only take on those values. A debugger can show the symbolic names, which can be helpful instead of just showing the raw values.

blocks|key|4834532|text|这些变量之间在功能上有什么区别，如果有的话？
|type|blockquote|depth|inlineStyleRanges|entityRanges|data|4834533|unstyled|4834534|shirt和jacket都是整数类型，但shirt是int，是enum+colour。后者是一个实现定义的整数类型，例如可以是unsigned+int。|offset|length|style|CODE|4834535|例如，在gcc中，默认情况下，enum+colour是unsigned+int。|4834536|现在使用enum类型的变量有一些优势。例如，一些编译器能够检测和警告不同enum类型的混淆.另外，如果您使用enum类型的对象作为switch语句的控制表达式，一些编译器(例如，gcc和-Wswitch)如果不列出所有enum常量情况，就可以发出警告。另外，调试器通常能够为enum对象值显示一些很好的符号。|4834537|entityMap^0|0|0|0|5|6|6|K|5|Q|3|V|B|1R|C|0|4|3|F|B|R|C|0|4|4|10|4|1I|4|1T|6|2H|3|2L|8|31|4|3T|4|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|-4|5|C|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|C|7|R|8|@$F|S|G|T|H|I]|$F|U|G|V|H|I]|$F|W|G|X|H|I]|$F|Y|G|Z|H|I]|$F|10|G|11|H|I]|$F|12|G|13|H|I]]|9|@]|A|$]]|$1|J|3|K|5|C|7|14|8|@$F|15|G|16|H|I]|$F|17|G|18|H|I]|$F|19|G|1A|H|I]]|9|@]|A|$]]|$1|L|3|M|5|C|7|1B|8|@$F|1C|G|1D|H|I]|$F|1E|G|1F|H|I]|$F|1G|G|1H|H|I]|$F|1I|G|1J|H|I]|$F|1K|G|1L|H|I]|$F|1M|G|1N|H|I]|$F|1O|G|1P|H|I]|$F|1Q|G|1R|H|I]]|9|@]|A|$]]|$1|N|3|-4|5|C|7|1S|8|@]|9|@]|A|$]]]|O|$]]

<blockquote>
 What's the functionaly difference, if any, between these variables?
</blockquote>

<code>shirt</code> and <code>jacket</code> are both of integer types but <code>shirt</code> is <code>int</code> and is <code>enum colour</code>. The latter is an implementation defined integer type and can be <code>unsigned int</code> for example.

In <code>gcc</code> for example, by default <code>enum colour</code> is <code>unsigned int</code>.

Now using variable of <code>enum</code> type has some advantage. For example, some compilers are able to detect and warn the mix-up of different <code>enum</code> types. Also if you use an object of an <code>enum</code> type as the controlling expression of a <code>switch</code> statement, some compilers (e.g., <code>gcc</code> with <code>-Wswitch</code>) are able to warn if you don't list all <code>enum</code> constant cases. Also debuggers are usually able to display some nice symbols for <code>enum</code> objects values.

blocks|key|4537303|text|哪种代码更容易理解？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4537304|Tshirt+tee+=+new+Tshirt();

tee.setColor(4);|code-block|syntax|javascript|4537305|或|4537306|enum+color+{+red,+green,+blue,+black,+pink,+grey,+brown+};
Tshirt+*tee+=+new+Tshirt();

tee.setColor(+pink+);|4537307|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Which code is more easily understandable?

<pre><code>Tshirt tee = new Tshirt();

tee.setColor(4);
</code></pre>

or

<pre><code>enum color { red, green, blue, black, pink, grey, brown };
Tshirt *tee = new Tshirt();

tee.setColor( pink );
</code></pre>

blocks|key|4537350|text|其中一个优点是，它增加了程序的可读性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4537351|例如：|4537352|enum+colour{white,+red=2,+green,+blue,+yellow,+black}+jacket;

int+shirt_price[10];

shirt_price[red]+=+50;
shirt_price[green]+=+100;
shirt_price[black]+=+500;|code-block|syntax|javascript|4537353|现在您不需要记住这里的索引，只需使用enum变量即可。|4537354|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

One of the advantages is, it increases program readability.

For example:

<pre><code>enum colour{white, red=2, green, blue, yellow, black} jacket;

int shirt_price[10];

shirt_price[red] = 50;
shirt_price[green] = 100;
shirt_price[black] = 500;
</code></pre>

Now you don't need to remember the indexes here just use enum variable.

What's the advantage of creating a variable of <code>enum</code> type? I know how to define an enum type, and a variable - however, I don't quite see the advantage?

<pre><code>#include &lt;stdio.h&gt;
int main(void){

 enum colour{
 white,
 red=2,
 green,
 blue,
 yellow,
 black
 } jacket;

 jacket=50;
 int shirt=yellow;
 printf("%d\n",jacket);
 printf("%d",shirt);

 return 0;
}
</code></pre>

In the above code, <code>jacket</code> is defined as <code>enum</code> but <code>shirt</code> is defined as an integer. The <code>enum</code> type doesn't prevent me from using a value that isn't specified as an element. Nor does the <code>integer</code> type prevent me from assigning it to a value from the <code>enum</code> type.

The above code gives the following output:

<pre><code>50
5
</code></pre>

What's the functionaly difference, if any, between these variables?

C and enumerations

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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创建一个enum类型的变量有什么好处？我知道如何定义枚举类型和变量--但是，我不太明白它的优点？#include <stdio.h>int main(void){ enum colour{ white, red=2, green, blue, ...

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