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#include <iostream>
#include <iomanip>
using namespace std;
const int NUM_REVIEWERS = 4; //Number of rows in reviews array
const int NUM_MOVIES = 6; //Number of columns in reviews array
void displayRatings(/*in*/const int[][NUM_MOVIES], /*in*/const int[], /*in*/int);
void showAverageRatings(/*in*/const int[][NUM_MOVIES], /*in*/const int[], /*in*/int);
void showReviewersHighestRating(/*in*/const int[][NUM_MOVIES], /*in*/const int[], /*in*/int);
void showReviewersLowestRating(/*in*/const int[][NUM_MOVIES], /*in*/const int[], /*in*/int);
void getNewRatings(/*out*/int[][NUM_MOVIES], /*in*/const int[], /*in*/int);
int main()
{
// Variable declarations
// 2D array to store initial ratings
int movieReviews[NUM_REVIEWERS][NUM_MOVIES] = {{3,1,5,2,1,5},
{4,2,1,4,2,4},
{3,1,2,4,4,1},
{5,1,4,2,4,2}};
// 1D array to store movie IDs
int movieID[NUM_MOVIES] = {100,101,102,103,104,105};
int choice; // user choice of menu options
do
{ //program interface with menu options
cout<<""<<endl;
cout<<"2D ARRAY PROCESSING MENU OPTIONS"<<endl;
cout<<""<<endl;
cout<<"1. Display current movie ratings"<<endl;
cout<<"2. Show the average rating for each movie."<<endl;
cout<<"3. Show a reviewers highest rated movie. (enter reviewer# 14)"<<endl;
cout<<"4. Show a movies lowest rating. (enter movie# 100105)"<<endl;
cout<<"5. Enter new ratings (15) for movie# 100105 for four reviewers"<<endl;
cout<<"6. Quit program"<<endl;
cout<<endl<<"Enter your choice:";
cin>>choice;
cout << endl;
switch (choice)
{
case 1 : displayRatings(movieReviews, movieID, NUM_REVIEWERS);
break;
case 2 : showAverageRatings(movieReviews, movieID, NUM_REVIEWERS);
break;
case 3 : showReviewersHighestRating(movieReviews, movieID, NUM_REVIEWERS);
break;
case 4 : showReviewersLowestRating(movieReviews, movieID, NUM_REVIEWERS);
break;
case 5 : getNewRatings(movieReviews, movieID, NUM_REVIEWERS);
break;
case 6 : cout << "Array processing test now concluded. Exiting program ....." << endl;
return 1;
break;
default : cout << "Please enter a choice from 1 to 6.";
}
}while(choice!=6);
return 0;
}
void displayRatings(const int ratings[][NUM_MOVIES], const int movie[], int rows)
{
cout << "********************** MOVIE RATINGS ********************" << endl;
cout << setw(9) << "REVIEWER\\";
for (int m = 0; m < NUM_MOVIES; m++)
cout << setw(5) << "MV#" << movie[m];
cout << "\n*********************************************************" << endl;
for (int i = 0; i < rows; i++)
{
cout << setw(5) << "#" << i + 1;
for (int j = 0; j < NUM_MOVIES; j++)
cout << setw(8) << ratings[i][j];
cout << endl;
}
cout << endl;
}
void showAverageRatings(const int ratings[][NUM_MOVIES], const int movie[], int rows)
{
displayRatings(ratings, movie, rows); // call to display current values
cout << "Average rating for each movie:" << endl;
for (int j = 0; j < NUM_MOVIES; j++)
{
int sum = 0; // set sum to 0 for each column
for (int i = 0; i < rows; i++)
sum = sum + ratings[i][j];
cout << "Movie #" << movie[j] << setw(6) << float(sum)/rows << endl;
}
cout << endl;
}
void showReviewersHighestRating(const int ratings[][NUM_MOVIES], const int movie[], int rows)
{
displayRatings(ratings, movie, rows); // call to display current values
int j; // loop control variable
int reviewer = 0; // variable to store user input
int count = 0; // counter for highest ratings
cout << "Enter a reviewer number (14), to find the Movie they rated the highest:";
cin >> reviewer;
// validate reviewer number range 1  4
while (reviewer < 1  reviewer > 4)
{
cout << "That is an invalid reviewer number." << endl;
cout << "Enter a reviewer number (14), to find the Movie they rated the highest:";
cin >> reviewer;
}
cout << "Reviewer #" << reviewer << " rated Movie #";
int highest = ratings[reviewer  1][0]; // initialize highest to 1st element
// of a given row
// loop through array to find highest ratings
for (j = 0; j < NUM_MOVIES; j++)
{
if (ratings[reviewer  1][j] > highest)
highest = ratings[reviewer  1][j];
}
// loop through array to count all highest occurencies
count = 0;
for (j = 0; j < NUM_MOVIES; j++)
{
if (ratings[reviewer  1][j] == highest)
count++;
}
// loop through array to print out highest rated movies
for (j = 0; j < NUM_MOVIES; j++)
{
if (ratings[reviewer  1][j] == highest)
{
cout << movie[j];
count ;
if (count == 1)
cout << " and ";
else if (count > 1)
cout << ", ";
else if (count == 0)
cout << " as the highest." << endl << endl;
}
}
}
void showReviewersLowestRating(const int ratings[][NUM_MOVIES], const int movie[], int rows)
{
displayRatings(ratings, movie, rows); // call to display current values
int movieNum; // variable to store user input
int j; // loop control variable
cout << "Enter a movie number (100105), to find the lowest rating:";
cin >> movieNum;
// validate movie numbers
while (movieNum < 100  movieNum > 105)
{
cout << "That is an invalid movie number." << endl;
cout << "Enter a movie number (100105), to find the lowest rating:";
cin >> movieNum;
}
// loop through 1D array to find the index of movieNum
for (j = 0; j < NUM_MOVIES; j++)
if (movieNum == movie[j])
break;
cout << "Movie #" << movieNum << "'s lowest rating is ";
int lowest = ratings[0][j];
// loop through array column to find the lowest rating
for (int i = 0; i < rows; i++)
{
if (ratings[i][j] < lowest)
lowest = ratings[i][j];
}
cout << lowest << endl << endl;
}
void getNewRatings(int ratings[][NUM_MOVIES], const int movie[], int rows)
{
cout << "********DATA ENTRY FOR NEW MOVIE RATINGS ***********" << endl;
// outer loop
for (int i = 0; i < rows; i++)
{
cout << "****************************************************" << endl;
cout << "REVIEWER# " << i + 1 << endl;
cout << "****************************************************" << endl;
// inner loop
for (int j = 0; j < NUM_MOVIES; j++)
{
cout << "Enter rating (15) for movie #" << movie[j] << ": ";
cin >> ratings[i][j];
// validate user entry range 1  5
while (ratings[i][j] < 1  ratings[i][j] > 5)
{
cout << "Invalid rating. It must be from 15." << endl;
cout << "Enter rating (15) for movie #" << movie[j] << ": ";
cin >> ratings[i][j];
}
}
}
cout << endl;
}
 