C Programming - Structures, Unions, Enums - Discussion

Structure is a user define data type so when a user defines a data type like
struct Student
{
int roll;
char name[10];
};

The statement struct Student declares a structure,
struct student s; // EQUIVALENT TO int n;

but
typedef is an abbreviation of data type definition.If a structure is declared using a typedef statement, it becomes a new data type.

typedef struct // STRUCTURE HAS BEEN DECLARED USING typedef STATEMENT
{
int roll;
char name[10];
}Student;

Now we only use
Student s; // instead of struct Student s; we don't have to use struct keyword again and again;

Hope this will help.

typedef is used to give alternative name for any of the data type.

In this example "typedef struct data mystruct" indicates that mystruct is same as type struct data.

Hence mystruct *b means b is a pointer of the type struct data.

typedef struct data mystruct;

Means we are making mystruct a member of struct at the time of declaration.

The typedef a simply definition of struct types which can be used for short name of structure definition.

I get this Error while compiling:

undefined reference to `WinMain@16'| !!!!

Can anyone help me?

"mystruct" will be replaced by "struct data" which will become a self-referential structure.

How does it know that struct data exist, since it is declared and defined later on?

Typedef is used for user defined data types to make our own data type.

Hello please explain the line "typedef struct data mystruct;".

Why we use typedef and what is it's meaning?