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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


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#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

Like functions, constructors can take parameters, allowing different arguments during object creation. You can also overload them to handle varying numbers of arguments.

main


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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

You are working with a Location class and need to initialize its attributes using a constructor.

Create a constructor that takes three parameters and assigns them to the instance variables.
Create an object of the Location class using the constructor.
Output the initialized attributes of the object to the console.

Løsning

solution

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Seksjon 2. Kapittel 2

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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


              1234567891011121314
            
#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

Like functions, constructors can take parameters, allowing different arguments during object creation. You can also overload them to handle varying numbers of arguments.

main


              123456789101112131415161718
            
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

You are working with a Location class and need to initialize its attributes using a constructor.

Create a constructor that takes three parameters and assigns them to the instance variables.
Create an object of the Location class using the constructor.
Output the 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