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Array of Pointer to Structure

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Syntax :

struct stud
{
    int roll;
    char name[10];
}*ptr[20];

Explain ?

1. Suppose we have to maintain database of 10 students . 
2. Here 10 Structures are Placed in the Memory and there base addresses are stored in Pointers .
3. E.g ptr[0],ptr[1] stores the address of First & second structure respectively.
4. Using the Array of Pointer the time required to access structure reduces.
5. This is used in Dynamic Memory Allocation

Diagram :

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Live Example :

#include<stdio.h>
#include<conio.h>
struct stud
{
    int roll;
    char name[10];
}*ptr[10];
//-------------------------------------
void main()
{
int i;
printf("Enter the Student Details : ");
 for(i=0;i<3;i++)
 {
   ptr[i] = (struct stud *) malloc(sizeof(struct stud)); 
   printf("\nEnter the Roll Number : ");
   scanf("%d",&ptr[i]->roll);
   printf("\nEnter the Name        : ");
   scanf("%s",ptr[i]->name);
 }
printf("\nStudent Details are : ");
 for(i=0;i<3;i++)
 {
   printf("\nRoll Number  : %d",ptr[i]->roll);
   printf("\nName         : %s",ptr[i]->name);
 }
getch();
}

Output :

Enter the Student Details :
Enter the Roll Number : 1
Enter the Name        : Pritesh
Enter the Roll Number : 2
Enter the Name        : Suraj
Enter the Roll Number : 3
Enter the Name        : Aruna
Student Details are :
Roll Number  : 1
Name         : Pritesh
Roll Number  : 2
Name         : Suraj
Roll Number  : 3
Name         : Aruna

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Tags / Keywords : | Array of Pointer to Structure, Pointer, structure

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