Answer to Question #215528 in C++ for Gel

Question

Create a class named MusicalComposition that contains fields for title, composer, and year written. Include a constructor that requires all three values and an appropriate display function. The child class NationalAnthem contains an additional field that holds the name of the anthem’s nation. The child class constructor requires a value for this additional field. The child class also contains a display function. Write a main()function that instantiates objects of each class and demonstrates that the functions work correctly. Save the file as Compositions.cpp.

Answer 1

#include <iostream>
#include <vector>

using namespace std;

struct Composer {
  string name;
};

class MusicalComposition {
  string title;
  Composer composer;
  int year;

  MusicalComposition(string title, string composerName, int year) {
    this->title = title;
    this->composer->name = composerName;
    this->year = year;
  }

  void display() {
    cout << "MusicanComposer = {" 
         << "title = " << this->title << ", "
         << "composerName = " << this->composer->name << ", "
         << "year = " << this->year << "}" << endl;
  }
};

class NationalAnthem : public MusicalComposition {
  vector<string> anthemNames;

  NationalAnthem(string title, string composerName, int year, vector<string> anthemNames) : MusicalComposition(title, composerName, year) {
    this->anthemNames = anthemNames;
  }

  void display() {
    cout << "NationalAnthem = {" 
         << "title = " << this->title << ", "
         << "composerName = " << this->composer->name << ", "
         << "year = " << this->year << ", "
         << "anthemNames" << this->anthemNames << "}" << endl;
  }
}

int main() {
  MusicalComposition m("Some title", "John", 2021);
  m.display();
  return 0;
}