Array of Structure in C

Structure is user defined data type which can store similar data items but of different data types.Structure can store different data types.Normally it represents a single record but if we have to store more record then we make array of structure.

Syntax to declare variable of array of Structure

Another way of creating variable of array of structure

#include<stdio.h>
struct student
{
int rollno;
float fee;
char name[10];
};

void main()
{
struct student st[5]; //array of structure
int i;
for(i=0;i<=4;i++)
{
printf("Enter rollno ");
scanf("%d",&st[i].rollno);
printf("Enter fee ");
scanf("%f",&st[i].fee);
printf("Enter name ");
scanf("%s",&st[i].name);
printf("\n");
}
for(i=0;i<=4;i++)
{
printf("\nRollno is %d",st[i].rollno);
printf("\nFee is %f",st[i].fee);
printf("\nName is %s",st[i].name);
printf("\n\n");
}//end of loop
}//end of main

Array within Structure means when we declare an array of data members of structure inside the block of structure.Let's understand it with an example:

Example to find the average marks of nine subjects through structures

#include<stdio.h>
struct student
{
char name[10];//array within structure
int subject[9];//array within structure
};
void main()
{
struct student st;
int sum=0,avg,i;
printf("Enter name");
gets(st.name);
for(i=0;i<9;i++)
{
printf("Enter the marks of %d subject",i+1);
scanf("%d",&st.subject[i]);
sum=sum+st.subject[i];
}
avg=sum/9;
printf("\n Average of nine subjects is %d",avg);
}//end of main