Splitting up classes c++ - c++

Question

I'm facing a problem for the past couple of days.
First of all, I had a project that I've done. But now I've to split it's classes.
Here's how I split the classes (a class as an example):
Header file:
#ifndef QUESTION_H
#define QUESTION_H
#include <string>
#include <iostream>
#include <fstream>
#include "Answer.h"
using namespace std;
// Name -- hold a first and last name
class Question {
protected:
string type; // Type of the question, e.g MC or TF
string text; // Text of the question
public:
// Default constructor
Question ();
// Getters and setters
string getType();
string getText();
void setType (string t);
void setText (string t);
// displayText -- Display the text of the question, unformatted at present
void displayText();
// Template pattern -- algorithm in parent which does its work calling child methods
virtual void displayAnswers();
virtual void display ();
// Virtual pure functions that must be implemented by each derived class
virtual int grade (Answer*); // grade a given answer
virtual Answer* readAnswer(istream &); // read a user's answer
};
#endif
Alright, now here is the implementation:
#include "Question.h"
#include <string>
#include <iostream>
#include <fstream>
using namespace std;
Question::Question () { type = ""; text = ""; }
// Getters and setters
string Question::getType() { return type; }
string Question::getText() { return text; }
void Question::setType (string t) { type = t; }
void Question::setText (string t) { text = t; }
// displayText -- Display the text of the question, unformatted at present
void Question::displayText() {
cout << text;
}
// Template pattern -- algorithm in parent which does its work calling child methods
void Question::displayAnswers(){ }// Require derived classes to implement
void Question::display () {
Question::displayText();
Question::displayAnswers(); // Call derived class's displayAnswers
}
// Virtual pure functions that must be implemented by each derived class
int Question::grade (Answer*){ return 0; } // grade a given answer
Answer* Question::readAnswer(istream &){ return 0; } // read a user's answer
Ok, so I've done the other classes the same exact way.
Now what's left is the MakeFile, here it is:
project: Question MCQuestion TFQuestion Answer IntAnswer CharAnswer Main
g++ -std=c++11 Question MCQuestion TFQuestion Answer IntAnswer CharAnswer Main -o project
.cc.o:
g++ -std=c++11 -c <−o#
Now when I try running make it brings up this message:
g++ Question.cpp -o Question
/usr/lib/gcc/i586-suse-linux/4.7/../../../crt1.o: In function `_start':
/home/abuild/rpmbuild/BUILD/glibc-2.17/csu/../sysdeps/i386/start.S:113: undefined reference to `main'
collect2: error: ld returned 1 exit status
make: *** [Question] Error 1
Can somebody explains it? or what am I doing wrong?
Thanks.
Edited:
Main.cc :
#include <iostream>
#include <fstream>
#include <string>
#include "Question.h"
#include "MCQuestion.h"
#include "TFQuestion.h"
#include "Answer.h"
#include "IntAnswer.h"
#include "CharAnswer.h"
#include <vector>
using namespace std;
int main () {
vector<Question *> questions; // Holds pointers to all the questions
ifstream infile ("questions.txt"); // Open the input file
int totalCorrect = 0; // Initialize the count from number of correct answers
// Read each question and place it into the questions vector
string questionType;
while ( getline (infile, questionType) ) {
if (questionType == "MC") {
MCQuestion *mc = new MCQuestion();
mc->read(infile);
questions.push_back(mc);
}
else if ( questionType[0] == 'T' or questionType[0] == 'F' ) {
TFQuestion* tf = new TFQuestion();
tf->read(infile);
tf->setAnswer(questionType[0]);
questions.push_back(tf);
}
else {
cout << "Input file is corrupt. Expected to find MC, T or F; found \"" << questionType << "\" instead." << endl;
}
}
infile.close();
// Pose each question, read and grade answers, tally total
int questionNo = 0;
for (auto &question: questions) {
// Pose the question
questionNo++; cout << questionNo << ". ";
question->display();
// Get the user's answer
Answer* ans = question->readAnswer(cin);
// Grade it and increment total
int correct = question->grade(ans);
totalCorrect = totalCorrect + correct
// Inform the user as to whether or not they got the question correct
cout << "Your answer was " << (correct?"":"not ") << "correct\n" << endl;
}
// Print the overall score
cout << "Your overall score is " << totalCorrect << "/"
<< questions.size() << endl;
return 0;
}

Answer 1

You create Makefile with lot of mistakes:
Should be something like this:
project: Question.o
g++ -std=c++11 $^ -o $#
.cc.o:
g++ -std=c++11 -c $< -o $#
add other dependencies into project in similar way, not forget defining main function in some of your .cc files.