Question

C++ Question

Question 3 [43] The Question: You are required to write a program for an Online Tutoring Centre to determine the weekly rate depending on the number of sessions the students attend and then to calculate total revenue for the center. The Online Tutoring Centre charges varying weekly rates depending on the on grade of the student and number of sessions per week the student attends as shown in Table 1 below. Grade 8 9 Session 1 75 80 Session 3 210 215 220 225 230 Session 2 140 145 150 155 160 Table 1 Session 4 280 285 290 295 300 10 85 90 11 12 95 You are required to develop an application that would accept high school student's data and display appropriates weekly rates based on sessions attended. The grade and prices for 4 sessions are stored in a.csv file called "ETutoring.csv". Read from the .csv and populate the arrays in class ETutoring. Save as Online Tutoring.hpp/cpp. Now follow the UML class diagram and description below and complete the ETutoring class. ETutoring grades: int() prices: double total: double + ETutoring() + fillArray(string): void + enter Learner(string&, int&, int&): void + determine Pricelint, int): double + getTotal():double + displayPrices():void + menu():int Marks Attribute/Method grades: int[] prices: double [[ total: double Description Data members. Grades is an array of type integer that will store grades in high school from grade 8 to 12. Prices is a two-dimensional array of type double that stores the different prices and the total stores the total revenue generated which must be of type double. (Marks for prototype)

Answer 1

#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <cstdlib>
#define MAXG 5
#define MAXS 4
using namespace std;

// Defines class ETutoring
class ETutoring
{
// Integer type array of size MAXG to store grades
int grades[MAXG];
// Double type matrix of size MAXG X MAXS to store price
double price[MAXG][MAXS];
// To store total price
double total;
public:
// Default constructor to assign default values to data members
ETutoring()
{
// Loops till maximum number of grade
for(int c = 0; c < MAXG; c++)
// Assigns 0 to each cell
grades[c] = 0;

// Loops till maximum number of grade
for(int r = 0; r < MAXG; r++)
// Loops till maximum number of session
for(int c = 0; c < MAXS; c++)
// Assigns 0.0 to each cell
price[r][c] = 0.0;
// total initializes to 0.0
total = 0.0;
}

// Function to read the file with parameter file name
// and stores the data in data members
void fillArray(string fileName)
{
// Variable for row and column
int row = 0;
int col = 0;
// To store comma
string comma;

// ifstream class object declared to read data from file
ifstream fileRead;

// Opens both the file for reading
fileRead.open(fileName.c_str());

// Checks if the file unable to open for reading display's error message and stop
if(!fileRead)
{
cout<<"\n ERROR: Unable to open the file "<<fileName<<" for reading.";
exit(0);
}// End of if condition

// Loops till end of the file
while(!fileRead.eof())
{
// Reads a grade and stores at row index position
fileRead>>grades[row]>>comma;

// Loops till maximum number of sessions
for(int col = 0; col < MAXS; col++)
{
// Checks if current column number is equals to MAXS minus one (for last column)
if(col == MAXS-1)
// Reads the price and stores at row and column index position (without reading comma)
fileRead>>price[row][col];

// Otherwise not the last column
else
// Reads the price and stores at row and column index position and also reads comma
fileRead>>price[row][col]>>comma;
}

// Increase the row index by one
row++;
}// End of while loop
cout<<"\n End of file reading.\n";
// Closer the file
fileRead.close();
}

// Function to display the grade and each session price
void displayPrices()
{
// Displays heading
cout<<setw(10)<<"\n Grades"<<setw(7)<<"1"<<setw(7)<<"2"<<setw(7)<<"3"<<setw(7)<<"4"<<endl;

// Loops till maximum number of grades
for(int r = 0; r < MAXG; r++)
{
// Displays the current grade
cout<<" "<<left<<setw(7)<<grades[r];

// Loops till maximum number of sessions
for(int c = 0; c < MAXS; c++)
// Displays the current session price
cout<<right<<setw(7)<<price[r][c];
cout<<endl;
}
}

// Function to accept name, grade and number of sessions and returns data using pass by reference
void enterLearning(string &name, int &grade, int &numberOfSessions)
{
// Accepts data
cout<<"\n Enter learners name: ";
cin>>name;
cout<<"\n Enter grade: ";
cin>>grade;
cout<<"\n Enter number of sessions: ";
cin>>numberOfSessions;
}

// Function to determine price based on the parameter grade and number of sessions
// returns the price
double determinePrice(int grade, int sessions)
{
// Initializes 0.0 for either invalid grade or session entered by the user.
double amount = 0.0;
// Checks the parameter grade and assigns appropriate price
switch(grade)
{
case 8:
amount = price[0][sessions-1];
break;
case 9:
amount = price[1][sessions-1];
break;
case 10:
amount = price[2][sessions-1];
break;
case 11:
amount = price[3][sessions-1];
break;
case 12:
amount = price[4][sessions-1];
break;
default:
cout<<"\n Invalid Grade or Session.";
}

// Adds the determine amount to total
total += amount;
// returns the amount
return amount;
}

// Function to return total amount collected
double getTotal()
{
return total;
}

// Function to display menu, accepts user choice and returns it
int menu()
{
int choice;
// Displays menu
cout<<"\n\n 1: Fill Arrays \n 2: Enter learning details \n 3: Total Revenue \n 4: Exit"
<<"\n : Select an option ";
// Accepts user choice
cin>>choice;
// Returns user choice
return choice;
}
};// End of class

// main function definition
int main()
{
// Creates an object of class ETutoring using default constructor
ETutoring et;
string name;
int grade;
int numberOfSessions;

// Loops till user choice is not 4
do
{
// Calls the function to accept user choice
// calls appropriate function based on returned user choice
switch(et.menu())
{
case 1:
et.fillArray("Tutoring.txt");
et.displayPrices();
break;
case 2:
et.enterLearning(name, grade, numberOfSessions);
cout<<"\n Grade is: "<<grade;
cout<<"\n Total cost is R "<<et.determinePrice(grade, numberOfSessions);
break;
case 3:
cout<<"\n Total cost of attending eTutor sessions are: "<<et.getTotal();
break;
case 4:
cout<<"\n Good~Bye";
exit(0);
default:
cout<<"\n Invalid choice!!";
}// End of switch - case
}while(1);// End of do - while loop
return 0;
}// End of main function

Sample Output:

1: Fill Arrays
2: Enter learning details
3: Total Revenue
4: Exit
: Select an option 1

End of file reading.

Grades 1 2 3 4
8 75 140 210 280
9 80 145 215 285
10 85 150 220 290
11 90 155 225 295
12 95 160 230 300

1: Fill Arrays
2: Enter learning details
3: Total Revenue
4: Exit
: Select an option 2

Enter learners name: Pam

Enter grade: 8

Enter number of sessions: 2

Grade is: 8
Total cost is R 140

1: Fill Arrays
2: Enter learning details
3: Total Revenue
4: Exit
: Select an option 2

Enter learners name: Susan

Enter grade: 9

Enter number of sessions: 2

Grade is: 9
Total cost is R 145

1: Fill Arrays
2: Enter learning details
3: Total Revenue
4: Exit
: Select an option 2

Enter learners name: Sam

Enter grade: 10

Enter number of sessions: 2

Grade is: 10
Total cost is R 150

1: Fill Arrays
2: Enter learning details
3: Total Revenue
4: Exit
: Select an option 3

Total cost of attending eTutor sessions are: 435

1: Fill Arrays
2: Enter learning details
3: Total Revenue
4: Exit
: Select an option 4

Good~Bye

Tutoring.txt file contents

8, 75, 140, 210, 280
9, 80, 145, 215, 285
10, 85, 150, 220, 290
11, 90, 155, 225, 295
12, 95, 160, 230, 300