Array of structures - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an array of structures in C?

An array of structures is a collection where each element is a structure. It lets you store multiple records of the same type together, like a list of students where each student has a name and age.

beginner

How do you declare an array of structures in C?

First, define a structure type using struct. Then declare an array of that structure type, for example: <br>struct Student { char name[20]; int age; } students[10]; creates an array of 10 students.

beginner

How do you access members of a structure inside an array?

Use the array index and dot operator. For example, students[0].age accesses the age of the first student. This is like picking a book from a shelf and then reading its title.

intermediate

Can you initialize an array of structures at declaration?

Yes, you can initialize it with values like this: <br>struct Student students[2] = { {"Alice", 20}, {"Bob", 22} }; This sets the first student's name and age, and the second student's too.

intermediate

Why use an array of structures instead of separate arrays?

Using an array of structures keeps related data together, making code easier to read and less error-prone. For example, storing names and ages in one array of structures is clearer than two separate arrays for names and ages.

How do you declare an array of 5 structures named 'Book' in C?

A array struct Book books[5];

B Book struct books[5];

C struct books Book[5];

D struct Book books[5];

The correct syntax is struct Book books[5]; where 'Book' is the structure type and 'books' is the array name.

How do you access the 'price' member of the third element in an array 'items' of structures?

A items[2].price

B items.price[3]

C items[3].price

D items->price[3]

Array indexing starts at 0, so the third element is at index 2. Use items[2].price to access it.

Which operator is used to access a member of a structure in an array?

A * (asterisk)

B -> (arrow)

C . (dot)

D & (ampersand)

Use the dot operator . to access members of a structure when you have the structure variable itself.

Can you initialize an array of structures at the time of declaration in C?

A No, initialization must be done later.

B Yes, using curly braces with values.

C Only for arrays of integers.

D Only if the array size is 1.

You can initialize an array of structures using curly braces with values for each element.

What is a benefit of using an array of structures?

A It groups related data together for easier management.

B It avoids using structures.

C It makes the program run faster always.

D It separates related data into different arrays.

An array of structures groups related data together, making it easier to manage and understand.

Explain how to declare and use an array of structures in C with an example.

Think about a list of students with name and age.

Describe the advantages of using an array of structures over separate arrays for related data.

Imagine storing names and ages separately vs together.