C Programming - Pointers - Discussion

"." is used to access elements of a class via an object of class,eg-
class cls
{
public int a;
//some other work in this class
}
void main()
{
cls cls1=new cls();
cls1.a=20;//using "." operator here
}

and -> is used to access the elements of structures( it includes linked lists queues and stacks) eg- obj->element, you can guess the example at least rihht? take care, bye bye

@indhu

Pointer is just the address value, where the variable is stored. To get the address value we use "->" its just an representation. Hope you understand.

I didn't understand.

Can you explain it clearly.

If a variable is a pointer to a structure, the operator used to access data members of the structure through the pointer variable is: -> (Arrow operator)

Explanation:
When you have a pointer to a structure, like this:

struct Student
{
int id;
char name[20];
};

struct Student *ptr;

To access members of the structure using the pointer, you use:

ptr->id;
This is shorthand for:
(*ptr).id;
But -> is more convenient and cleaner.
For accessing members using normal structure variables.
-> For accessing members using structure pointers.

An individual structure member can be accessed in terms of its corresponding pointer variable by writing.

ptr -> member.

->(spangles) = accesses the pointer variable that contains the address of another variable.

*(as-trick) = points the value of the variable declared.

&(ampersand) = points the address of the variable declared

enum(enumeration) = user-defined data type.

eg:

{
int a[10]={1,4,5);
printf("%d",a[3]);
}

output is 6.

Explanation: successive no.of 5 is 6.

Yes, Its ans is D ex:

struct student
{
char name[20];
int rn;
}*s1;

If we access these data members in main then use,

//INPUT FROM KEYBOARD.

scanf("%s%d",s1->name,&s1->rn);

//DISPLAY THE OUTPUT.

printf("\nname= %s\troll no = %d",s1->name,s1->rn);

enum is a one of the userdefined datatype,and it defines the list of keywords.

Ex:
enum rainbow
{
1.Red
2.Orange
3.Yellow
4.Green
5.Blue
6.Indigo
7.Violet
} ;

Can we make use of ". " operator instead of "->" operator?

What is enum? in what situation we use it? can anybody help me out? please.