Thread: multiple definition, undefined reference to

I kind of re-arranged things here.. I put all the classes in a header file by themselves, replaced inline functions.. I commented out or removed any functions that caused a linker error. Everything here compiles. Take a look and compare to what ye' got and slowly work up to what you want from code that compiles.


student.h

Code:

/* Skapar elever, tilldelar dem kön samt betyg */


#ifndef STUDENT_H
#define STUDENT_H

#include <iostream>

using std::cin;
using std::cout;

class student
{
public:

     //student();
     //~student();
     void setGender(); // FALSE=boy, TRUE=girl
     void giveGrade();
     float getGrade();//{return grade;}
     bool getGender();//{return gender;}

private:

     bool gender;
     double grade;
};

#endif // STUDENT_H

student.cpp

Code:

#include "student.h"
using namespace std;
// Funktioner

void student::setGender()
{
     bool sex;
     std::cout << "Specify sex of student; 1 (girl) or 0 (boy): ";
     std::cin >> sex;
     gender=(sex=0?0:1);
}

void student::giveGrade()
{
     std::cout << "Specify student grade: (1-5) ";
     std::cin >> grade;
}

float student::getGrade()//{return grade;}
{
	return grade;
}

bool student::getGender()//{return gender;}
{
	return gender;
}

calc.h

Code:

#ifndef CALC_H
#define CALC_H
  
#include"student.h"
#define students 20




class klass : public student 
{
public:

     klass();
     ~klass();
     float AvGradeGirls();//{return AvGradeG;} medelbetyg för tjejer
     float averagegrade();//{return totGrade;} medelbetyg
     float AvGradeBoys();//{return AvGradeB;}  medelbetyg för killar
     //void addstudent();  //This function was never defined
     int numBo();//{return numB;}  Antal B
     int numGi();//{return numG;}  Antal G
     int totalStudents(){return numG+numB;} // Totala antalet studneter
     void collect();
     void calcaverage();


private:

     student stud[students];
     int Ggrade;
     int Bgrade; // Tjejsor och killsars sammanlagda betyg (ej  medelvärde)
     int numG;
     int numB;
     double AvGradeB; // Gossars betyg
     double AvGradeG; // Flickors betyg
     double totGrade; // Totala betyget
};

#endif // CALC_H

calc.cpp

Code:

#include "calc.h"
#include "student.h"
using namespace std;


klass::klass() : numG(0), numB(0), AvGradeG(0), AvGradeB(0), totGrade(0)
{
}

klass::~klass()
{
}

void klass::collect()
{	

	for(int i=(numG+numB);i>0;i--)
	{
		if(getGender()) // om getGender() är sann = tösabete...
		{
			Ggrade=Ggrade+getGrade();
			numG++;
		} 

		else // ...annars en hane
		{
			Bgrade=Bgrade+getGrade();
			numB++;  
		}
	}
}


void klass::calcaverage()
{
	if(numG>0) // Inte dela med noll
		AvGradeG=Ggrade/numG;

	if(numB>0) // inte dela med noll
		AvGradeB=Bgrade/numB;

	if((numB+numG)>0) // inte dela med noll
		totGrade=(Bgrade+Ggrade)/(numB+numG);
}

float klass::AvGradeGirls()//{return AvGradeG;}// medelbetyg för tjejer
{
	return AvGradeG;
}

float klass::averagegrade()//{return totGrade;} // medelbetyg
{
	return totGrade;
}


float klass::AvGradeBoys()//{return AvGradeB;} // medelbetyg för killar
{
	return AvGradeB;
}

int klass::numBo()//{return numB;}  Antal B
{
	return numB;
}

int klass::numGi()//{return numG;}  Antal G
{
	return numG;
}

main.cpp

Code:

#include <iostream>
#include "calc.h"
#include "student.h"

using std::cin;
using std::cout;
using std::endl;

bool menu();

int main(int argc, char *argv[])
{
     int SEL;

     klass klass1; // Initiera ett objekt, "Klass", av klassen Klass

     cout << "Menu selection:\n1.Add student data\n2.Randomize    student data\n3.Exit" << endl;

     cin >> SEL;

     switch(SEL)
     {
          case 1:  //klass1.addstudent();  //ERROR HERE
          break;

          case 2:
          break;

          case 3:
          return 0;

          default:   cout << "ERROR" << endl;
     }

     klass1.collect();
     klass1.calcaverage();
     cout << "de " << klass1.numBo() << " killarnas medel \x84r " <<   klass1.AvGradeBoys() << "\n\n";
     cout << "de " << klass1.numGi() << " tjejernas medel \x84r " << klass1.AvGradeGirls() << "\n\n";
     cout << "de " << (klass1.numGi()+klass1.numBo()) << " studenternas medel \x84r " << klass1.averagegrade() << endl;

     cin.ignore(255,'\n');
     cin.get();
     return 0;
}

--------------------Configuration: main - Win32 Debug--------------------
Compiling...
calc.cpp
student.cpp
main.cpp
Linking...

main.exe - 0 error(s), 0 warning(s)