Question

I have seen structure declarations which looks like this one

typedef struct br {
        int year;
        int km;

} Car;

I know that I can use that structure like

Car ford;
ford.year = 1980;
ford.km = 12

But for what “br” stands in the declaration ?

Answer 1

br is called the structure tag.

The new type created is struct br and Car is just a type alias for struct br.

This declaration

struct br ford;

is equivalent to this declaration:

Car ford;   // ford is of type struct br

Also the combo form:

typedef struct br {
    int year;
    int km;
} Car;

is equivalent to these declarations:

struct br {
    int year;
    int km;
};

typedef struct br Car;