Defining structures in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a structure in C++?

A structure in C++ is a user-defined data type that groups related variables of different types under one name. It helps organize data like a real-life object with multiple properties.

beginner

How do you define a simple structure named Person with name and age?

You define it like this:<br>

struct Person {<br>  std::string name;<br>  int age;<br>};

beginner

How do you create a variable of a structure type and access its members?

First, declare a variable of the structure type, then use the dot . operator to access members.<br>Example:<br>

Person p;<br>p.name = "Alice";<br>p.age = 30;

intermediate

Can structures in C++ have functions inside them?

Yes! Structures in C++ can have functions (called member functions) just like classes. This lets you group data and behavior together.

intermediate

What is the difference between a structure and a class in C++?

The main difference is default access:<br>- In a structure, members are public by default.<br>- In a class, members are private by default.<br>Otherwise, they are very similar.

How do you define a structure in C++?

A Using the keyword <code>class</code> only

B Using the keyword <code>function</code>

C Using the keyword <code>define</code>

D Using the keyword <code>struct</code> followed by the structure name and members

Structures are defined using the struct keyword followed by the name and member variables.

What operator is used to access members of a structure variable?

A Colon (:) operator

B Dot (.) operator

C Comma (,) operator

D Arrow (->) operator

The dot operator is used to access members of a structure variable.

What is the default access level of members in a C++ structure?

A Public

B Protected

C Private

D Package

Members of a structure are public by default.

Can a structure in C++ contain functions?

A Only if declared as <code>class</code>

B No, structures can only have variables

C Yes, structures can have member functions

D Only in C, not in C++

In C++, structures can have member functions just like classes.

Which of the following is a correct way to declare a structure variable?

A Both A and B

B struct Person p;

C Person p;

D None of the above

Both Person p; and struct Person p; are valid in C++.

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

Think about grouping related data under one name and how to use it.

Describe the differences and similarities between structures and classes in C++.

Focus on access and behavior.