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- /*
- * exercise19.c
- *
- * Created on: 2012-11-5
- * Author: xiaobin
- */
- enum myStr
- {
- x1,
- x2,
- x3=10,
- x4,
- x5
- }x;
- int main(int argc, char* argv[])
- {
- x = (enum myStr) 0x801005, 0x8010f4;
- printf("%x\n", x + 5);
- return 0;
- }
首先，我们要知道mySt枚举常量的在未赋值的情况下，第一个常量为0，以此类推x2-1；在赋初值时，下一个常量+1，x4-11，x5-12；
然后，要知道枚举变量默认取第一个常量的值，即x1；
最后，要知道编译器对枚举变量不检查取值，即只取所赋的第一个值；
输出结果：
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- 80100a
附：标准使用枚举的例子
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- enum status_type
- {
- ok = 200,
- created = 201,
- accepted = 202,
- no_content = 204,
- multiple_choices = 300,
- moved_permanently = 301,
- moved_temporarily = 302,
- not_modified = 304,
- bad_request = 400,
- unauthorized = 401,
- forbidden = 403,
- not_found = 404,
- internal_server_error = 500,
- not_implemented = 501,
- bad_gateway = 502,
- service_unavailable = 503
- } status