Question

C++

Create a User class, with a separate interface (User.h) and implementation (User.cpp), comprised of the following attributes:

Data members (private):
string: username
int array: ratings	Number of elements should be size
int: numRatings	Number of books in the database
Int: size	The capacity of the ratings array (50). Constant
Member functions (public):
Default constructor	Sets username to an empty string, numRatings to 0, size to 50, and all the elements of ratings array to the value 0
Parameterized constructor	Takes a string, an array of integers, and one integer for initializing username, ratings, and numRatings, respectively. Make sure the value passed into the constructor for numRatings does not exceed the value of the data member size
getUsername()	Returns username as a string
setUsername(string)	(void) Assigns username the value of the input string
getRatingAt(int)	Parameter: int index. Returns the rating stored at the specified index. If index is larger than the size of the ratings array, returns -1.
setRatingAt(int,int)	Parameters: int index, int value. Sets the rating to value at the specified index, if index is within the bounds of the array and value is between 0 and 5. Returns a boolean, true if the rating is successfully updated and false otherwise.
getNumRatings()	Returns numRatings
setNumRatings(int)	(void) Assigns numRatings the value of the input int
getSize()	Returns size

Answer 1

If you have any doubts, please give me comment...

User.h

#ifndef USER_H

#define USER_H

#include <string>

using namespace std;

class User{

private:

string username;

int ratings[50];

int numRatings;

int size;

public:

User();

User(string uname, int _ratings[], int n_ratings);

string getUsername();

void setUsername(string uname);

int getRatingAt(int ind);

bool setRatingAt(int ind, int val);

int getNumRatings();

void setNumRatings(int val);

int getSize();

~User();

};

#endif

User.cpp

#include "User.h"

User::User(){

username = "";

numRatings = 0;

size = 50;

for(int i=0; i<size; i++)

ratings[i] = 0;

}

User::User(string uname, int _ratings[], int n_ratings){

username = uname;

size = 50;

numRatings = n_ratings;

for(int i=0; i<n_ratings; i++)

ratings[i] = _ratings[i];

}

string User::getUsername(){

return username;

}

void User::setUsername(string uname){

username = uname;

}

int User::getRatingAt(int ind){

if(ind<numRatings)

return ratings[ind];

return -1;

}

bool User::setRatingAt(int ind, int val){

if(ind<size){

ratings[ind] = val;

return true;

}

return false;

}

int User::getNumRatings(){

return numRatings;

}

void User::setNumRatings(int val){

numRatings = val;

}

int User::getSize(){

return size;

}

User::~User(){

}

Answer 2

Program:

User.h

User.cpp

-------------------------------------------------------------------------------

Output:

--------------------------------------------------------------------

Program:

User.h

#include<string>

using namespace std;

class User
{
   private:
       //Declare the member variables.
       string username;
       int ratings[50];
       int numRatings;
       int size;

   public:
       //Define the member functions.
       User();
       User(string name, int[], int);
       string getUsername();
       void setUsername(string);
       int getRatingAt(int);
       bool setRatingAt(int,int);
       int getNumRatings();
       void setNumRatings(int);
       int getSize();
};

User.cpp

// ConsoleApplication41.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include<iostream>
#include<string>
#include "User.h"
using namespace std;

   //Default constructor
   User::User()
   {
       username = "";
       numRatings = 0;
       size = 50;

       for (int i = 0; i < size; i++)
           ratings[i] = 0;
   }

   //Parameterized constructor
   User::User(string name, int arr[], int rating)
   {
       username = name;

       if (rating <= size)
           numRatings = rating;
       else
           numRatings = 0;

       for (int i = 0; i < numRatings; i++)
           ratings[i] = arr[i];
   }

   //Returns the username.
   string User::getUsername()
   {
       return username;
   }

   //Sets the username.
   void User::setUsername(string name)
   {
       username = name;
   }

   //Returns the rating at a given index.
   int User::getRatingAt(int index)
   {
       if (index > size)
           return -1;

       return ratings[index];
   };

   //Sets the rating at a given index.
   bool User::setRatingAt(int index, int value)
   {
       if (index <= 0 || index > size)
           return false;

       else
           ratings[index] = value;
   }

   //Returns the variable numRatings.
   int User::getNumRatings()
   {
       return numRatings;
   }

   //Sets the value of the variable numRatings.
   void User::setNumRatings(int nr)
   {
       numRatings = nr;
   }

   //Returns the variable size.
   int User::getSize()
   {
       return size;
   }

   //Driver function.
int main()
{
   User user;
   user.setNumRatings(5);
   user.setRatingAt(1, 5);
   user.setRatingAt(2, 7);
   user.setRatingAt(3, 9);
   user.setRatingAt(4, 4);
   user.setRatingAt(5, 8);

   cout << "The rating for index 2 is:" << user.getRatingAt(2)<<endl;

   system("pause");
  
}