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: