Trouble declaring some variables

[AAAbb7]

I'm supposed to create a menu, but when I try to run my program in codeRunner it says that a few of my variables were not declared, how can I fix that?

#include <string>
#include <iostream>

using namespace std;

class Movie
{
public: // member functions
    // constructors
    Movie();
    Movie(string title, string releaseYear); // default constructor
    // getters
    string getTitle();
    string getReleaseYear();
    // setters
    void setTitle(string);
    void setReleaseYear(string);

private:                // data members
    string title;       // title of movie
    string releaseYear; // release year of movie
};

Movie::Movie()
{
    this->setTitle("");
    this->setReleaseYear("");
}

// parameterized constructor
Movie::Movie(string title, string releaseYear)
{
    this->setTitle(title);
    this->setReleaseYear(releaseYear);
}

// function
string Movie::getTitle()
{
    return title;
}

// function to set movie title
void Movie::setTitle(string title)
{
    this->title = title;
}

// function
string Movie::getReleaseYear()
{
    return releaseYear;
}

// function
void Movie::setReleaseYear(string releaseYear)
{
    this->releaseYear = releaseYear;
}

class User
{
private:
    string username;
    const static int size = 50;
    int ratings[size];
    int numRatings;

public:
    User();
    User(string username, int ratings[], int numRatings);
    string getUsername();
    void setUsername(string);
    int getRatingAt(int);
    bool setRatingAt(int, int);
    int getNumRatings();
    void setNumRatings(int);
    int getSize();
};

User::User() // calls the default constructor
{
    username = "";  // makes a emputy string
    numRatings = 0; // makes numratings = 0
    for (int i = 0; i < size; i++)
    {
        ratings[i] = 0; // makes the ratings array become 0
    }
}

User::User(string inputname, int inputratings[], int inputnumrating) // calls the function from Class User
{
    username = inputname;
    numRatings = inputnumrating;
    for (int i = 0; i < size; i++)
    {
        ratings[i] = 0;
    }
    for (int i = 0; i < numRatings; i++)
    {
        ratings[i] = inputratings[i]; // makes the rating array equal to inputratings array
    }
}

string User::getUsername() // calls the function from Class User
{
    return username;
}

void User::setUsername(string inputname) // calls the function from Class User
{
    username = inputname;
}

int User::getRatingAt(int index) // calls the function from Class User
{
    int rate = 0;
    if (index >= size) // if index is greater than or equal to size
    {
        return -1;
    }
    else // if index is less than size
    {
        rate = ratings[index];
        return rate;
    }
}

bool User::setRatingAt(int index, int val) // calls the bool function from Class User
{
    bool value;                                                 // bool value
    if ((val >= 0 && val <= 5) && (index < size && index >= 0)) // make sure both statements are true
    {
        ratings[index] = val;
        value = true;
    }
    else
    {
        value = false;
    }
    return value;
}

int User::getNumRatings() // calls the function from Class User
{
    return numRatings;
}

void User::setNumRatings(int inputnumratings) // calls the function from Class User
{
    numRatings = inputnumratings;
}

int User::getSize() // calls the function from Class User
{
    return size;
}

int main() 
{
    Movie movies[50];
    User users[100];

    int choice;
    do {
        cout << "\n====== Main Menu ======\n";
        cout << "1. Read movies\n";
        cout << "2. Read ratings\n";
        cout << "3. Print movies by year\n";
        cout << "4. Get rating\n";
        cout << "5. Find number of movies user rated\n";
        cout << "6. Quit\n";
        cin >> choice;

        string filename, username, title;
        int retVal, year, rating;
        switch(choice) {
            case 1:
                cout << "Enter a movie file name: ";
                cin >> filename;
                retVal = readMovies(filename);
                if(retVal == -1)
                    cout << "No movies saved to the database.\n";
                else if(retVal == -2) 
                    cout << "Database is already full. No movies were added.\n";
                else if(retVal == 50)
                    cout << "Database is full. Some movies may have not been added.\n";
                else if(retVal >= 0 && retVal < 50)
                    cout << "Total movies in the database: " << retVal << endl;
                break;
            case 2:
                cout << "Enter a movie file name: ";
                cin >> filename;
                retVal = readRatings(filename);
                if(retVal == -1)
                    cout << "No users saved to the database.\n";
                else if(retVal == -2) 
                    cout << "Database is already full. No users were added.\n";
                else if(retVal == 100)
                    cout << "Database is full. Some users may have not been added.\n";
                else if(retVal >= 0 && retVal < 100)
                    cout << "Total users in the database: " << retVal << endl;
                break;
            case 3:
                cout << "Enter release year of movie: ";
                cin >> year;
                printMoviesByYear(year);
                break;
            case 4:
                cout << "Enter a user name: ";
                getline(cin, username);
                cout << "Enter a movie title: ";
                getline(cin, title);
                retVal = getRating(username, title);
                if(retVal == 0)
                    cout << username << " has not rated\n";
                else if(retVal == -3)
                    cout << "does not exist\n";
                else 
                    cout << "ratedwith " << retVal << endl;
                break;
            case 5:
                cout << "Enter a user name: ";
                getline(cin, username);
                retVal = getCountWatchedMovies(username);
                if(retVal == 0)
                    cout << username << " has not rated any movies\n"; 
                else if(retVal == -3)
                    cout << "does not exist\n";
                break;
            case 6:
                cout << "Good bye!\n";
                break;
            default:
                cout << "Invalid input.\n";  
        }
    } while(choice != 6);
    return 0;
}

And this is the syntax error I get:
Syntax Error(s)
__tester__.cpp: In function ‘int main()’:
__tester__.cpp:183:45: error: ‘readMovies’ was not declared in this scope
retVal = readMovies(filename);
^
__tester__.cpp:196:46: error: ‘readRatings’ was not declared in this scope
retVal = readRatings(filename);
^
__tester__.cpp:209:39: error: ‘printMoviesByYear’ was not declared in this scope
printMoviesByYear(year);
^
__tester__.cpp:216:51: error: ‘getRating’ was not declared in this scope
retVal = getRating(username, title);
^
__tester__.cpp:227:56: error: ‘getCountWatchedMovies’ was not declared in this scope
retVal = getCountWatchedMovies(username);
^

[Peter87]

You're trying to call functions named "readMovies", "readRatings", "printMoviesByYear", "getRating" and "getCountWatchedMovies" but there are no functions with those names.