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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

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


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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); }

Taak

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.

Oplossing

solution

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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


              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); }

Taak

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.

Oplossing

solution

Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties

Was alles duidelijk?

Bedankt voor je feedback!

Sectie 2. Hoofdstuk 2

Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties