Defining structures - Cheat Sheet & Quick Revision

Recall & Review

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What is a structure in C?

A structure in C is a user-defined data type that groups different variables under one name. These variables can be of different types and are called members.

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How do you define a structure in C?

You use the keyword struct followed by the structure name and curly braces containing member declarations. For example:<br>

struct Point {<br>  int x;<br>  int y;<br>};

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How do you create a variable of a structure type?

After defining a structure, you create variables by specifying the structure name. For example:<br>

struct Point p1;

creates a variable p1 of type struct Point.

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How do you access members of a structure variable?

Use the dot operator . to access members. For example, p1.x = 10; sets the x member of p1.

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Can structures contain different data types as members?

Yes, structures can have members of different types, like int, float, char, or even other structures.

Which keyword is used to define a structure in C?

A class

B typedef

C union

D struct

The keyword struct is used to define structures in C.

How do you access the member 'age' of a structure variable 'person'?

A person.age

B person->age

C age.person

D person:age

Use the dot operator: person.age to access members of a structure variable.

What is the correct way to declare a structure variable named 'car' of type 'struct Vehicle'?

A struct Vehicle car;

B struct car Vehicle;

C Vehicle car;

D car struct Vehicle;

The correct syntax is struct Vehicle car;.

Can a structure contain members of different data types?

A Only if they are all floats

B No

C Yes

D Only if they are all integers

Structures can contain members of different data types.

Which of the following is a valid structure definition?

A struct Person [ int age; float height; ];

B struct Person { int age; float height; };

C struct Person ( int age; float height; );

D struct Person < int age; float height; >;

Structures are defined using curly braces { }, like in option C.

Explain how to define a structure and create a variable of that structure in C.

Think about the syntax using 'struct' and how you name and use the structure.

Describe how you can use structures to group different types of data together.

Imagine a structure as a box holding different things related to one object.