I have two enums in my code:
enum Month {January, February, March, April, May, June, July,
August, September, October, November, December};
enum ShortMonth {Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec};
May is a common element in both enums, so the compiler says:
Redeclaration of enumerator '
May'.
Why does it say so? And how can I circumvent this?
I suggest you merge the two:
enum Month {
Jan, January=Jan, Feb, February=Feb, Mar, March=Mar,
Apr, April=Apr, May, Jun, June=Jun,
Jul, July=Jul, Aug, August=Aug, Sep, September=Sep,
Oct, October=Oct, Nov, November=Nov, Dec, December=Dec};
Which will have exactly the same effect, and is more convenient.
If you want January to have the value 1, instead of 0, add this:
enum Month {
Jan=1, January=Jan, Feb, February=Feb, ....
My suggestion here is to have just one enum, as they are the same type. If you want short aliases to type less in your code (even if I wouldn't advise you to do so), you can do:
enum Month {
January, Jan = January,
February, Feb = February,
March, Mar = March,
April, Apr = April
May,
June, Jun = June,
July, Jul = July,
...};
And to have different presentation names (short and long), you should have two distinct string arrays that are indexed by the enum.
char[MAX_MONTH_NAME_LENGTH][12] month_long_names = {
"January", "February", ...
}
char[3][12] short_long_names = {
"Jan", "Feb", ...
}
printf("month %d long name is %s, and short name is %s\n", May, long_month_names[May], short_month_names[May]);
In C enums are used without any type prefix, so you write:
month[0] = January;
month[4] = May;
The enum Month and ShortMonth have the same scope so the compiler can't know which May to use. An obvious fix would be to prefix the enums but i'm not sure that your use of these enums in this case is warranted.