Thread: Nested structure doubt

Originally Posted by vajra11

This define structure whose name is student

Your first struct declaration is not syntactically correct in the first place. Perhaps what you wanted to do was this:

Code:

struct student {
    char name[30];
    int rollNo;
    struct dateOfBirth *age;
} DOB; /* created structure varoable DOB */

The above declares a struct named struct student with three members:

• name of type char[30]
• rollNo of type int
• age of type struct dateOfBirth*

Additionally, the declaration also declares an object of type struct student named DOB. Note that there is no "nested structure" in your example: what you have is a member of a pointer to struct type.

Originally Posted by vajra11

Does this declaration is equivalent to below declaration ?

No, your second struct declaration is not syntactically correct either. The line that you mentioned is simply invalid syntax.

Originally Posted by laserlight

Your first struct declaration is not syntactically correct in the first place.

I missed bracket

lets take an example of a structure

Code:

struct student {
    char name[30];   //name of type char[30]
   int rollNo;          //rollNo of type int
    struct dateOfBirth *age; //age of type struct dateOfBirth*
} DOB; /* created structure varoable DOB */

I don't understand red line in the structure

Code:

struct student {    
   char name[30];   //name of type char[30]
    int rollNo;         //rollNo of type int

    struct dateOfBirth *age; //age of type struct dateOfBirth*
} DOB; /* created structure varoable DOB */

Pointer is variable that hold the address of another variable

We have declared structure datoFBirth using pointer

What is use of this line struct dateOfBirth *age; ?

I think it's structure member that is pointer to structure and age is pointer that store the address

What;s the pointer pointing here