FAQ: Classes and Objects - Constructors

This community-built FAQ covers the “Constructors” exercise from the lesson “Classes and Objects”.

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7 posts were split to a new topic: [PENDNG] Typo in the explanation’s image

Why are we using new_title and new_artist here? can’t we just go with (std::string title,std::string artist) ?

It’s the lesson and what it tells you to do. Although, it’s not a function it’s a parameter so you can’t overload it as far as I know. By that I mean there’s already existing strings so the program would get confused and cause an error.

In slide 5/7, I think there is a small mistake in instruction. Please have a look at following screenshot. The line “#include “city.hpp”” should be written after “// city.cpp”, not after “// city.hpp”. Please correct me if I’m wrong.


I had an error message referencing Song.cpp, even though I passed the exercise. This is the error message:
song.cpp:9:29: error: no ‘std::__cxx11::string Song::get_title()’ member function declared in class ‘Song’
std::string Song::get_title() {
song.cpp:15:30: error: no ‘std::__cxx11::string Song::get_artist()’ member function declared in class ‘Song’
std::string Song::get_artist() {

(Scroll down)

This is my code:
#include "song.hpp"

// add the Song constructor here:
Song::Song(std::string new_title, std::string new_artist) {
  title = new_title;
  artist = new_artist;

std::string Song::get_title() {

  return title;


std::string Song::get_artist() {

  return artist;


What did I do wrong?

I think I had the same error, you only need one instance of Song and no colons in the area after the comment.
Song(std::string new_title, std::string new_artist)
Hope this helps!

Define two functions in song.hpp:-

std::string get_artist();
std::string get_title();

Hopefully this solves your problem :smiley:

"Is there a way to give an object some data right when it gets created? "

that’s the first sentence you’ll encounter in this topic. the answer is to instantiate the object during declaration! then what’s the purpose of “constructors” then? seems redundant and fancy.

I’ve reviewed the solution for this lesson having got a bit stuck. Having done so, and gone back through the lesson, I can’t help but feel instruction 1 and the examples didn’t explain what was required to complete this lesson.

Anybody else feel the same?

1 Like

Firstly, instantiating an object just creates the object, it doesn’t initialize it with any passed in data values. Difference between instantiation and initialization:

Car my_car; // Instantiation (and initialization of default attributes if the class has it)
my_car.set_speed(120); // Initialization of speed (assuming it has no default value)

Point p1(10, 100); // Instantiation and initialization of both attributes on the same line

Secondly, constructors are used to give the object data when it gets created unlike methods. Look at the example above, we are able to initialize a point with an x and y coordinate on the same line that we instantiate it. Without a constructor, we would need methods like set_x(); and set_y(); and there would needed to be called

Everything a constructor does can, of course, be done with methods. However, constructors are useful by making the program more concise and simpler (imagine having a class with 20 or more attributes that needed to be initialized with each object- would you want to call 20 methods, or just one constructor?). The constructor creates the object the way you want it to be created, and the (non static) methods manipulate, get info about or do other things with the object