Constructor and Attributes

One of the primary usage of the constructors is to initialize attributes of the class. A default constructor, for example, can be used to set initial values. For example:

main


              12345678910111213141516
            
#include <iostream>

class Person {
public:
    Person() {
        name = "undefined";
    }
    
    std::string name;
};

int main()
{
    Person person;
    std::cout << person.name;
}

If you don't specify value for name attribute of the object, it will be set to underfined as a default. You can try removing this constructor to see what changes occur.

Initializing Attributes with Constructor

Just as functions a constructor can accept parameters, allowing you to pass different arguments when instantiating an object. Also, constructor can be overrided, so you can increase flexibility, for instance varying number of arguments.

main


              123456789101112131415
            
class Person {
public:
    Person(std::string _name, std::string _surname, int _age) 
    {
        name = _name;
        surname = _surname;
        age = _age;
    }

    std::string name;
    std::string surname;
    int age;
};

int main() { Person person("Bob", "Song", 23); }

Завдання

Swipe to show code editor

Create a constructor for the Location class that takes three parameters and initializes the instance variables with these values.
Output initialized attributes of the object to the console.

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 2. Розділ 2

Constructor and Attributes

One of the primary usage of the constructors is to initialize attributes of the class. A default constructor, for example, can be used to set initial values. For example:

main


              12345678910111213141516
            
#include <iostream>

class Person {
public:
    Person() {
        name = "undefined";
    }
    
    std::string name;
};

int main()
{
    Person person;
    std::cout << person.name;
}

If you don't specify value for name attribute of the object, it will be set to underfined as a default. You can try removing this constructor to see what changes occur.

Initializing Attributes with Constructor

main


              123456789101112131415
            
class Person {
public:
    Person(std::string _name, std::string _surname, int _age) 
    {
        name = _name;
        surname = _surname;
        age = _age;
    }

    std::string name;
    std::string surname;
    int age;
};

int main() { Person person("Bob", "Song", 23); }

Завдання

Swipe to show code editor

Create a constructor for the Location class that takes three parameters and initializes the instance variables with these values.
Output initialized attributes of the object to the console.

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 2. Розділ 2