Sveip for å vise menyen

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); }

Oppgave

Swipe to start coding

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.

Løsning

solution

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 2. Kapittel 2

Spør AI

Spør om hva du vil, eller prøv ett av de foreslåtte spørsmålene for å starte chatten vår

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); }

Oppgave

Swipe to start coding

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.

Løsning

solution

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 2. Kapittel 2

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor