Question

IP requirements:

Load an exam

Take an exam

Show exam results

Quit

Choice 1: No functionality change. Load the exam based upon the user's prompt for an exam file.

Choice 2: The program should display a single question at a time and prompt the user for an answer. Based upon the answer, it should track the score based upon a successful answer. Once a user answers the question, it should also display the correct answer with an appropriate message (e.g., "Good job" or "Better luck next time") Upon completion of the exam, the program should return the user to the menu.

Choice 3: The program should display the total points available and the total points scored during that exam. A percentage score should also be displayed. (Optional: if you choose to track which problems were missed, you could display that information for the user.)

Choice 4: No change to this functionality from the Phase 4 IP. You should consider creating an additional class Student that will track student's score through methods such as addPointsPossible, addPointsScored, getPointsPossible, and getPointsScored. You should also enhance your Exam class to include methods getPointValue and getAnswer. You may also want to add a method to only display one question at a time, such as displayQuestion.

having the header file student.h is throwing errors and pragma once is also throwing errors. I use dev c++ I have googled and tried different things to get it to compile and run properly to no avail. Please give me some assistance with this thanks.

code I am working with. -----------

//student.h

#pragma once

#include <string>

#ifndef STUDENT_H
#define STUDENT_H

using namespace std;

class Student
{
private:
   double pointsPossible;
   double pointsScored;
  
public:
   Student()
   {
       pointsPossible = 0.0;
       pointsScored = 0.0;
   }
   void addPointsPossible(double p)
   {
       pointsPossible += p;
   }
   void addPointsScored(double p)
   {
       pointsScored += p;
   }
   double getPointsPossible()
   {
       return pointsPossible;
   }
   double getPointsScored()
   {
       return pointsScored;
   }
};

#endif

//Exam.cpp

#include <iostream>
#include <cstdlib>
#include <string>
#include <fstream>
#include "Student.h"

//Use the standard namespace.
using namespace std;

//Define the class Test.
class Test

{
private:
   //Create an object of the string class to store the name of the file.
   string testfile;
public:
   //Declare the default constructor.
   Test();
   //Declare the parameterized constructor.
   Test(string);
   //Declare the function to load the file.
   bool loadfile();
   //Declare the function to display the file.
   void displayfile();
   //Declare the function to display quetions one at a time.
   void displayQuestion(Student*);
   //Declare the function to get point value.
   double getPointValue();
   //Declare the function to get answer.
   char getAnswer();
};

//Define the default constructor.

Test::Test()
{
   //Initialize the file name with default value.
   testfile = "";
}

//Define the parameterized constructor.
Test::Test(string filename)
{
   //Initialize the file name with the parameter.
   testfile = filename;
}

//Define the function to load the file.
bool Test::loadfile()
{
   //Open the file in read mode.
   ifstream file(testfile.c_str());

   //Check if the file exists or not.
   if (!file)
   {
       //Display the error message.
       cout << "\nFile not found.";
       //Return the value false.
       return false;
   }

   //Close the file.
   file.close();

   //Return the value true.
   return true;

}

void Test::displayQuestion(Student *s)
{
   //Open the file in read mode.
   ifstream file(testfile.c_str());

   //Create an object of the string class.
   string temp;
   char ans;
   getline(file, temp);
   cout << endl << temp;
   getline(file, temp);

   //Start the while loop till end of file.
   while (!file.eof())
   {      
       if (atoi(temp.substr(0, 1).c_str()) != 0)
       {
           cout << "\nEnter Your answer : ";
           cin >> ans;
           s->addPointsPossible(1);
           s->addPointsScored(1);
           cout << endl << temp;
           getline(file, temp);
       }
       else
       {  
           cout << endl << temp;
           getline(file, temp);
       }
   }

   cout << endl << temp;
   cout << "\nEnter Your answer : ";
   cin >> ans;
   s->addPointsPossible(1);
   s->addPointsScored(1);
  
   //Close the file.
   file.close();
}

//Define the function to display the file.
void Test::displayfile()
{
   //Open the file in read mode.
   ifstream file(testfile.c_str());

   //Create an object of the string class.
   string temp;

   //Start the while loop till end of file.
   while (!file.eof())
   {
       //Read a line from the file and store in temp.
       getline(file, temp);
       //Display the string.
       cout << endl << temp;
   }

   //Close the file.
   file.close();
}

//Define the main() function.
int main()
{
   //Create an object of string class to store the name of the file.
   string filename;

   //Create variable to store the input.
   bool check;
   char c = 'y';
   Student *s = new Student();

   //Start the while loop.
   while (c == 'y' || c == 'Y')
   {
       //Create a variable of int type.
       int select = 0;
      

       //Display the main menu.
       cout << "EXAM MENU\n\n";
       cout << "1. Load an exam" << endl;
       cout << "2. Take an exam" << endl;
       cout << "3. Show exam results" << endl;
       cout << "4. Quit." << endl;

       //Prompt the user to enter a choice.
       cout << "\nEnter your choice : ";

       //Store the user input.
       cin >> select;

       //Check if the user entered the first option.
       if (select == 1)
       {
           //Prompt the user to enter the name of the file.
           cout << "Enter the filename : ";
           //Store the input in the string.
           cin >> filename;
           //Create an object of the Test class with the file name.
           Test t(filename);
           //Call the function to load the file.
           check = t.loadfile();
           //Check if the file exists or not.
           if (check)
           {
               //Display status message.
               cout << "\nLoaded successfully.";
               //Prompt the user to enter the choice.
               cout << "\nDo you want to display the file? (y/n) : ";
               //Store the input.
               cin >> c;
               //Check the value entered by the user.
               if (c == 'y')
               {
                   //Display the output message.
                   cout << "\nThe content of the file is as follows:\n";
                   //Call the function to display the content of the file.
                   t.displayfile();
               }

           }

       }

       //Check if the user entered the second option.
       else if (select == 2)
       {
           //Prompt the user to enter the name of the file.
           cout << "Enter the filename : ";
           //Store the input in the string.
           cin >> filename;
           //Create an object of the Test class with the file name.
           Test t(filename);
           //Call the function to load the file.
           check = t.loadfile();
           //Check if the file exists or not.
          
           if (check)
           {
               t.displayQuestion(s);
           }
       }

       //Check if the user entered the third option.
       else if (select == 3)
       {
           cout << "Marks Obtained : " << s->getPointsScored() << endl;
           cout << "Out of : " << s->getPointsPossible() << endl;
           cout << "Percentage Marks : " << (s->getPointsScored() / s->getPointsPossible()) * 100 << endl;
       }

       else if (select == 4)
       {
           break;
       }

       //Move to the else case.
       else
       {
           //Display the error message.
           cout << "\nPlease enter a valid input.";
       }

       //Prompt the user to enter the choice.
       cout << "\nDo you want to enter again? (y/n) : ";
       //Update the value of the variable.
       cin >> c;
   }

   //Display the exiting message.
   cout << "\nExiting from the program... Thank you!" << endl;
   //Return 0 and exit from the program.
   return 0;

}

//output

Answer 1

---------------------I used Visual studio 2013, C++ language as well as DEV C++ ---------------

I found out that why it is throwing errors.

You are using "pragma once" in your header file.

Pragma once is a preprocessor directive designed to cause the current source file to be included only once in a single compilation. Pragma once advantages like : Avoidance of name clashes and improvement in compilation speed.

---------------DEV C++-----------------

So if you compiled more than once it will throw error like this.

If you removed the pragma once in your header file, you can compile more than once.

If you are getting Source file not compiled error, You need to compile source file, In our example Exam.cpp

So if you remove pragma once in your header file doesn't make much difference in your small program.
You can remove if you want or you can add pragma once after the program is created as per your expectation.

Your code have no other mistakes, I don't know about question and answer patterns, So i simply create a text file with sample data to show that program works fine.

----------Output Screenshot in Visual studio----------

----------Output Screenshot in DEV C++----------

-----------------Sample Text File----------