Quiz model
- C++ course
- Intermediate
- Lesson 42/116
- 6 min
Design the skeleton of Question and Quiz classes.
Quiz model
In this five-lesson project you will build a Quiz app. Each lesson adds one piece, and by the final lesson you will have a working application.
First we define a Question struct. A question has a text and an answer: struct Question { std::string text; std::string answer; };. Then we define an empty Quiz class. In the following lessons we will add methods for adding questions, running the quiz and calculating the score. Each lesson's starting code will contain the previous lesson's solution.
Struct and class
This project uses both struct and class. Question is a struct that holds simple data; Quiz is a class with behavior.
The first lesson prepares only the skeleton: you define the Question struct and an empty Quiz class. In main you print std::cout << "Quiz ready"; to confirm the program runs. In the next lessons we will add methods on top of this skeleton, and the output will grow each lesson.
Practice Define the Question and Quiz skeleton
Define a Question struct with std::string text; and std::string answer; members. Define an empty Quiz class. In main print std::cout << "Quiz ready";.
Starter code
#include <iostream>
#include <string>
// Define the Question struct and Quiz class here
int main() {
// Print the Quiz ready message
return 0;
}Sample solution
#include <iostream>
#include <string>
struct Question {
std::string text;
std::string answer;
};
class Quiz {
};
int main() {
std::cout << "Quiz ready";
return 0;
}Expected output
Quiz ready
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Which fields does the Question struct contain?
struct Question { ??? };- title and author
- name and age
- id and email
- text and answer Correct answer
Explanation: The Question struct contains text and answer fields.
2 Complete the Question struct
struct Question { std::string ____; std::string answer; };struct Question { std::string text; std::string answer; };Explanation: The question text is stored in the text field.
3 Match each piece to its role
| Term | Meaning |
|---|---|
struct Question |
Data structure |
class Quiz |
Behavior class |
std::string |
Text type |
std::cout |
Writing output |