An array is a collection of variables of the same type referenced by a common name. A structure groups variables of different types. An array of structures combines these concepts by creating an array where each element is a structure. For example, an array of fraction structures could be defined to hold multiple fractions. Each structure element in the array contains a numerator and denominator integer. The entire array of structures occupies a contiguous block of memory with each structure taking up the same amount of space. Individual structure elements can then be accessed using the array index and dot notation.

2. What is array ?
An array is a collection of variables of the same data type that
are referenced by a common name .
Eg:
int arr[3];
0 (2bytes) 1(2bytes) 2(2bytes)
arr[0] arr[1] arr[2]

3. What is structure ?
A structure is a grouping of several variables of different
data types. Struct keyword is used.
Eg:
struct book
{ int page; (2bytes) (15bytes) (4bytes)
char author[15]; page author price
float price;
};

4. What is Arrays of structures ?
Since an array can contain similar elements , the
combination having structures within array is an
array of structures .

5. Arrays of structures
Eg:
struct fraction
{
int numerator; // 2 bytes
int denominator; //2 bytes
};
Struct fraction f1[4]; // this is an array of structure

6. Memory allocation of arrays of structures
Total size of f1 = 4*2*2=16 bytes
0 (4) 1 (4) 2 (4) 3(4)
N D N D N D N D
f1[0] f1[1] f1[2] f1[3]

7. Accessing the elements of array of structure
Struct fraction f1[4];
For(i=0;i<4;i++)
{
Printf(“%d”,f1[i].numerator);
Printf(“%d”,f1[i].denominator);
}

8. Thank you
Any queries ?
prepared by :
Arushi