Post date: Apr 29, 2011 8:58:22 AM
1) struct <structtag>
{
}
2) typedef struct
{
}<structtag>
if you want to define a structure you have to follow (1)
later if you want to use structure created by method (1) you must use
following notation in order to declare a variable e.g.
struct <structtag> var_name; e.g.
struct Person{
char name[30];
int height;
};
if you want to declare variable of Person structure you have to follow as..
struct Person Baira, John;
Here keyword <struct> is complusory with <Person> any were you want to use that structure.
whereas typedef defines a type what it proceeds like...
typedef float CURRENCY
here CURRENCY is now a type and you can declare variables of type CURRENCY like
CURRENCY usd, euro;
following the above rule, typedef will defince a type of <structtag>
e.g.
typedef struct {
char name[30];
int height;
} Person;
now Person is a type; and you can declare variables of Person type e.g.
Person Baira, John;
above structure can also be written as
typedef struct Person{
char name[30];
int height;
};