Declaring enumerated data type

I'm asked to create a SortType enumerated data type that stores two values, BY_TITLE and BY_YEAR. I'm then trying to implement a void addBookToList(SortType s, ListType *list, BookType *b) function that finds the new book’s correct insertion point in the list, based on the sort type indicated in the s parameter.

If the sort type is BY_TITLE, the book must be inserted in alphabetical order by title, and if the sort type is BY_YEAR, the book must be inserted in ascending order by year.

When I try to create the addBookToList function I keep getting the error:

expected declaration specifiers or ‘...’ before ‘SortType’ void addBookToList(SortType s, ListType *list, BookType *b)

I'm not sure if I'm declaring my SortType data type correctly and would appreciate some help.

defs.h:

Code:

---

enum sort{
    BY_TITLE,
    BY_YEAR
} SortType;


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book.c

Code:

---

void addBookToList(SortType s, ListType *list, BookType *b){
    if(s == BY_TITLE){
    }
    if(s == BY_YEAR){
    }
}


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I tried just changing the data structure in defs.h to:

Code:

---

enum SortType{
    BY_TITLE,
    BY_YEAR
};

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and the error changed to 'unknown type name 'SortType'; did you mean 'ListType'? void addBookToList(SortType s, ListType *list, BookType *b)

Your enum type is named enum sort. While declaring the enum, you also declared a variable of the enum type named SortType. What you probably wanted to do was to use a typedef so that SortType would be an alias for enum sort:

Code:

---

typedef enum sort{
    BY_TITLE,
    BY_YEAR
} SortType;

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