Thread: help with classes

here is my program, i am trying to set s3 equal to s1.unionSet(s2), unionSet works fine when i dont set it to s3, but i need to set it equal to s3 for a school project. someone please help me.

//header

#include <fstream.h>
#include <iostream.h>
#ifndef header_h
#define header_h

class PrimeNumSet
{
public:
PrimeNumSet(const char obj_name[] = 0, int num1 = 0, int num2 = 0, int num3 = 0, int num4 =0, int num5 =0, int num6 = 0);
void emptySet();
void set_obj(const char obj_name[], int num1 = 0, int num2 = 0, int num3 = 0, int num4 =0, int num5 =0, int num6 = 0);
void inputSet();
void printSet();
void insertElem(int e);
void unionSet(const PrimeNumSet &s2 );
void interSect(const PrimeNumSet &s2 );
void deleteElem(int e);
int isEqualTo(const PrimeNumSet &s2 );

private:
int set[100];
int input[100];
int valid(int e) const;
char name[31];

};

#endif

//funcitons


#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>
#include <math.h>
#include "primeSet.h"
#include <string.h>


PrimeNumSet::PrimeNumSet(const char obj_name[], int num1, int num2, int num3, int num4, int num5, int num6)
{

set_obj(obj_name, num1, num2, num3, num4, num5, num6);
strcpy(name, obj_name);

}
void PrimeNumSet::emptySet()
{
for(int i = 0; i <102; i++)
{
set[i] = 0;
}
}
void PrimeNumSet::set_obj(const char obj_name[], int num1, int num2, int num3, int num4, int num5, int num6)
{
emptySet();
if (valid(num1))
{
insertElem(num1);
}
if (valid(num2))
{
insertElem(num2);
}
if (valid(num3))
{
insertElem(num3);
}
if (valid(num4))
{
insertElem(num4);
}
if (valid(num5))
{
insertElem(num5);
}
if (valid(num6))
{
insertElem(num6);
}
}

void PrimeNumSet::inputSet()
{
int e;
cin >> e;
while(e != 999)
{
insertElem(e);
cin >> e;
}
out << "\n Entry complete; inputSet() called."<<endl;
}

void PrimeNumSet:rintSet()
{
int i =0;
out << " The set " << name << " is:"<< endl;
out << "{ ";
for(i=0; i < 102; i++)
{
if(set[i] == 1)
{
out << i << " ";
}
}
out << "}"<< endl;
out << " printSet() called" << endl;
}

void PrimeNumSet::insertElem(int e)
{
if(valid(e))
{
set[e] = 1;
}
}
int PrimeNumSet::valid(int e) const
{
int validSet[101] = {0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0};

return validSet[e] == 1;
}

void PrimeNumSet::unionSet(const PrimeNumSet &s2)
{
for(int i = 0; i <102; i++)
{
set[i] = (set[i] | s2.set[i]);
}
out << "\n unionSet() called." << endl;
}


//main

#include <stdlib.h>
#include <fstream.h>
#include <iomanip.h>
ofstream out("cphw2e.txt");
ifstream fcin("cphw2e_i.txt");
#include "primeSet.h"
#include "primeSettest.cpp"
// Note : in all files replace all cout by out
// and replace all cin by fcin

int main()
{
PrimeNumSet s1("s1"), s2("s2"), s3("s3"), s4("s4");
PrimeNumSet s5("s5", 10, 21, 67, 59, 26, 41), s6("s6", 9, 71, 97, 21);

s1.inputSet();
s1.printSet();
s2.inputSet();
s2.printSet();
s3 = s1.unionSet(s2);/*******this line wont work like this **/
out << endl << " The union of s1 and s2 is: " << endl;
s3.printSet();
return 0;
}