Write about Pointers and Structures?

We know that the name of an array stands for the add of its zeroth etc. The same thing is true  of the names of a arrays of structure variable.

Suppose ‘product’ is an array variable of struct type. The name ‘product’ represents the add of its zeroth element.

Ex:– 

struct inventory

{

char name[20];

int no;

float price;

}

product [2],*ptr;

This statement declares product as an array of 2 elements, each of the type struct inventory & ptr as apointer to data objects of the type struct inventory. The assignment

ptr=product;

Would assign the address of the zeroth element of product to ptr.

i.e; the pointer ptr will now point to product[0]. It’s members can be accessed using the following notation.

ptr->name

ptr->no

ptr->price

the symbol -> is called the arrow operator (member selection operator) and is made up of a minus sign and a greater than sign.

When the pointer ptr is incremented by one, it is made to point to the next record, i.e., product[1].

The following for statement will print the values of members of all the elements of product array.

            for(ptr=product;ptr

            printf(“%s%d%f\n”,ptr->name, ptr->no, ptr->price);

Ex:–Structure using pointers.

#include<stdio.h>

#include<conio.h> 

main()

{

struct book

            {

            char name[20];

            char author[20];

            int id;

            };

struct book b₁={“C”, “swamy”, 100};

struct book *p;

p=&b1;

printf(“%s%s%d\n”, b1.name,b1.author, b1.id);

printf(“%s%s%d\n”, p->name, p->author, p->id);

getch();

}