枚举的两个值一样有什么意义？

[believefym]

enum XX{a=0,b,c=1,d};
int main()
{
XX test = b;
if(test==b)
cout<<"y"<<endl;
if(test==c)
cout<<"y"<<endl;
return 0;
}

因为b和c都为1，输出为两个y，这样的设计有什么意义呢？感觉反而不好了，谁给解释一下

[ms_ms]

关注。。。

[mu_yang]

7月31天
8月31天
但你不能说7月也是8月

[xalangying]

enum{Sunday=7, Week7 = 7};
为什么会没用就像 string 提供 length 也提供 size 一样

[tangshuiling]

设枚举表示为一些人的体重 enum {zhangsan=70,wangwu=70,zhaoliu=80};
接下来便可以如此来用cout<<"zhangsan weight:"<<zhangsan<<"wangwu weight:"<<wangwu<<endl;

[visame]

基本同意tangshuiling
http://kolpackov.net/projects/c++/enum/
In The Design and Evolution of C++ Bjarne Stroustrup gives interesting details about the
history of enumerations in C and C++. Apparently, they were not part of
the original C design and were reluctantly added later. Bjarne also admits
that he was not very interested in enumerations as a feature and added
them with some minor modifications needed to fit into the concept of
user-defined types. It should not be a surprise, therefore, that enumeration
types abound in all sorts of little defects and inconveniences.

[独孤过儿]

enum XX{a=0,b,c=1,d};

枚举中的XX可以等价的想象成int类型，然后a、b、c、d可以想象成一个const类型的变量，那这个问题就和下面的代码没有什么区别了：

const int a = 0;
const int b = 1;
const int c = 1;
const int d = 2;

[thecorr]

guanzhu

[霁云]

枚举变量只是增加了程序的可读性而已，所指向内容为同值只是巧合

[xuhui_7810]

没有什么深层次的意义,只是有时须要中间两个为同一值而已