Difference Between Array and Structure In C?

                                                            Array

An array is a collection of similar type of data elements

An array is a derived data type

Array element access takes less time than structure

Array allocates static memory and uses index/subscript for accessing elements of the array

Example:

#include<stdio.h>

#include<conio.h>

void main()

{

   int i;

    clrscr();

   int arr[5] = {10,20,30,40,50};

   /* Above array can be initialized as below also

      arr[0] = 10;

      arr[1] = 20;

      arr[2] = 30;

      arr[3] = 40;

      arr[4] = 50; */

   for (i=0;i<5;i++)

   {

      // Accessing each variable

      printf("value of arr[%d] is %d \n", i, arr[i]);

   }

getch();

 }

Output

value of arr[0] is 10                                                                                                          

value of arr[1] is 20                                                                                                          

value of arr[2] is 30                                                                                                          

value of arr[3] is 40                                                                                                          

value of arr[4] is 50

                               Structure

Structure is a collection of different types of data elements

Structure is a user defined data type.

Structure element access takes more time.

Structure allocates dynamic memory and uses (.) operator for accessing elements of the Structure

Example:

#include<stdio.h>

#include<conio.h>

struct emp

{

int id;

char name[50];

float sal;

};

 void main()

{

struct emp e1;

clrscr();

printf("Enter employee Id, Name, Salary: ");

scanf("%d",&e1.id);

scanf("%s",&e1.name);

scanf("%f",&e1.sal);

printf("Id: %d\n",e1.id);

printf("Name: %s\n",e1.name);

printf("Salary: %f\n",e1.sal);

getch();

}

Output:

Enter employee Id, Name, Salary:                                                                                               

101                                                                                                                            

Dev                                                                                                                            

240000                                                                                                                         

Id: 101                                                                                                                        

Name: Dev   

Salary: 240000.000000