c++ Using a second constructor - c++

Question

Hi guys I am trying to do my homework and I've been stuck with some constructors. I am supposed to do this:
Write a program that uses a class named MovieData to store the
following information about a movie:
Title, Director, Year Released, Running Time (in minutes).
Include a constructor that allows all four of these member data
values to be specified at the time a MovieData variable is created.
The program should create two MovieData variables.
Have a method that displays the information about the movie in a clearly formatted manner.
Now include two additional attributes that hold the movie's production costs and first-year revenues.
Add a second constructor so that all six member values can be
specified when a MovieData variable is created.
Copy the method that displays the movie data to create a second method that displays the title, director, release year, running time, and first year's profit or loss.
So far I have this done:
// ch7movie
// By Kevin Mok
#include <iostream>
#include <string>
using namespace std;
class MovieData
{
public:
string title;
string director;
int yearReleased;
int runningTime;
double productionCost;
double firstYearRevenue;
MovieData(string titl, string dir, int yr, int rT, double pC, double fyR); // constructor
};
//Defining constructor
MovieData::MovieData(string titl, string dir, int yr, int rT, double pC, double fyR)
{
title = titl;
director = dir;
yearReleased = yr;
runningTime = rT;
productionCost = pC;
firstYearRevenue = fyR;
}
//Function of movie info
void displayMovieInfo(MovieData movieName)
{
cout << "----------------------------" << endl;
cout << "Title: " << movieName.title << endl;
cout << "Director: " << movieName.director << endl;
cout << "Year Released: " << movieName.yearReleased << endl;
cout << "Running Time: " << movieName.runningTime << " minutes" << endl;
cout << "Production Cost: $" << movieName.productionCost << endl;
cout << "First Year's Profit': $" << movieName.firstYearRevenue - movieName.productionCost << endl;
cout << "----------------------------\n" << endl;
}
int main()
{
MovieData movie1("C++ in English", "JohnCna", 2010, 120, 36500, 50000);
MovieData movie2("Great Programmer", "RKO", 2013, 130, 36500, 100000);
displayMovieInfo(movie1);
displayMovieInfo(movie2);
return 0;
}
I know that I don't have my second constructor, and this is my problem. I have no idea how to declare it; I've been reading my book, but I am having a lot of trouble, because it does not say anything about it. It'd be great if you someone could guide me a little bit

Answer 1

You already have one constructor. Simply do the exact same thing with the other constructor, just with different parameters, like the requirements say to.
And you need to change your displayMovieInfo() standalone function into a method of the class, like the requirements say to.
Try this:
// ch7movie
// By Kevin Mok
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
class MovieData
{
public:
string title;
string director;
int yearReleased;
int runningTime;
double productionCost;
double firstYearRevenue;
// constructors
MovieData(string titl, string dir, int yr, int rT);
MovieData(string titl, string dir, int yr, int rT, double pC, double fyR);
void displayMovieInfo();
void displayMovieInfoAndCosts();
};
//Defining constructors
MovieData::MovieData(string titl, string dir, int yr, int rT)
{
title = titl;
director = dir;
yearReleased = yr;
runningTime = rT;
productionCost = 0.0;
firstYearRevenue = 0.0;
}
MovieData::MovieData(string titl, string dir, int yr, int rT, double pC, double fyR)
{
title = titl;
director = dir;
yearReleased = yr;
runningTime = rT;
productionCost = pC;
firstYearRevenue = fyR;
}
//Methods to display movie info
void MovieData::displayMovieInfo()
{
cout << "----------------------------" << endl;
cout << "Title: " << title << endl;
cout << "Director: " << director << endl;
cout << "Year Released: " << yearReleased << endl;
cout << "Running Time: " << runningTime << " minutes" << endl;
cout << "----------------------------\n" << endl;
}
void MovieData::displayMovieInfoAndCosts()
{
cout << "----------------------------" << endl;
cout << "Title: " << title << endl;
cout << "Director: " << director << endl;
cout << "Year Released: " << yearReleased << endl;
cout << "Running Time: " << runningTime << " minutes" << endl;
cout << "Production Cost: $" << setprecision(2) << productionCost << endl;
cout << "First Year's Profit': $" << setprecision(2) << firstYearRevenue - productionCost << endl;
cout << "----------------------------\n" << endl;
}
int main()
{
MovieData movie1("C++ in English", "JohnCna", 2010, 120, 36500, 50000);
MovieData movie2("Great Programmer", "RKO", 2013, 130, 36500, 100000);
movie1.displayMovieInfo();
movie1.displayMovieInfoAndCosts();
movie2.displayMovieInfo();
movie2.displayMovieInfoAndCosts();
return 0;
}