ASP 1.0 - Needing some help with my C++ program.

Hey guys I'm haveing trouble with a c++ program I'm trying to creat it has to deal with fractions and a menu to choose to add subtract multiply and dived or just to simply exit. Also i need to simply the fractions to the lowest form. It compiles but doesnt simplify or actually choose the right number you input where the menu part is. I'll place a copy of it on the bottom of this if you can help it would be very appreciated.
Thank you.

#include <iostream>
#include <conio.h>
#include <iomanip>
using namespace std;

class fracType
{
private:
int numerator, denominator, n1, n2, d1, d2;
void simplify ();

public:
fracType (int = 2, int = 3);
~fracType(){cout << "\nDestructor is Running";}
void add (const fracType&, const fracType&);
void subtract (const fracType&, const fracType&);
void multiply (const fracType&, const fracType&);
void divide (const fracType&, const fracType&);
void showFrac () const ;
void setFrac () ;
};


fracType::fracType(int n, int d)
{
numerator = n;
denominator = d;
}

void fracType::add(const fracType& frac1, const fracType& frac2)
{
numerator = (frac1.n1 * frac2.d2 + frac2.n2 * frac1.d1);

denominator = (frac1.d1 * frac2.d2);
}

void fracType::subtract(const fracType & frac1, const fracType & frac2)
{
numerator = (frac1.n1 * frac2.d2 - frac2.n2 * frac1.d1);

denominator = (frac1.d1 * frac2.d2);
}

void fracType::multiply(const fracType & frac1, const fracType & frac2)
{
numerator = (frac1.n1 * frac2.n2);

denominator = (frac1.d1 * frac2.d2);
}
void fracType::divide(const fracType & frac1, const fracType & frac2)
{
numerator = (frac1.n1 * frac2.d2);

denominator = (frac1.d1 * frac2.n2);
}

void fracType::setFrac()
{
cout << "Enter a Numerator and a Denominator of a Fraction: ";
cin >> n1 >> d1;

cout << "\n\nEnter another Numerator and a Denominator of a Fraction: ";
cin >> n2 >> d2;
}
void fracType::showFrac() const
{
cout << "The Option you have choosen has Equaled: "
<< numerator << "/" << denominator;
}


int main()
{
char c;
fracType x0, x1, ADD, SUB, MULT, DIV;

x1.setFrac();

cout << setw(30) << "Fraction Calculation Menu: \n";

cout << setw(5) << "1 -- ADDITION \n"
<< setw(5) << "2 -- SUBTRACTION \n"
<< setw(5) << "3 -- MULTIPLICATION \n"
<< setw(5) << "4 -- DIVISION \n"
<< setw(5) << "5 -- EXIT \n"
<< setw(5) << "Enter a Number of 1-5: ";
cin >> c;

if(1)
{
ADD.add(x0,x1);
ADD.showFrac();
}
else if (2)
{
SUB.subtract(x0,x1);
SUB.showFrac();
}
else if (3)
{
MULT.multiply(x0,x1);
MULT.showFrac();
}
else if (c = 4)
{
DIV.divide(x0,x1);
DIV.showFrac();
}
else if (5)
{
cout << "Good Bye";
_getch();
}
else
{
x0.showFrac();
}

_getch ();
return 0;
}

Hey everyone thats looking at this.. ive been working on it all weekend and i still cant figure it out.. plz if u can help me id really apprecait it.. please help ty for all thats looking at my forum though..

you were close, just needed to make things match up.

#include <iostream>
#include <conio.h>
#include <iomanip>
using namespace std;

class fracType
{
private:
int numerator, denominator, n, d, fn, fd, wn;
void simplify ();

public:
fracType (int = 0, int = 1);
~fracType(){cout << "\nDestructor is Running";}
void add (const fracType&, const fracType&);
void subtract (const fracType&, const fracType&);
void multiply (const fracType&, const fracType&);
void divide (const fracType&, const fracType&);
void showFrac () const ;
void setFrac () ;
};


fracType::fracType(int numerator, int denominator)
{
fn = numerator;
fd = denominator;
}

void fracType::add(const fracType& frac1, const fracType& frac2)
{
fn = (frac1.n * frac2.d + frac2.n * frac1.d);

fd = (frac1.d * frac2.d);
}

void fracType::subtract(const fracType & frac1, const fracType & frac2)
{
fn = (frac1.n * frac2.d - frac2.n * frac1.d);

fd = (frac1.d * frac2.d);
}

void fracType::multiply(const fracType & frac1, const fracType & frac2)
{
fn = (frac1.n * frac2.n);

fd = (frac1.d * frac2.d);
}
void fracType::divide(const fracType & frac1, const fracType & frac2)
{
fn = (frac1.n * frac2.d);

fd = (frac1.d * frac2.n);
}

void fracType::setFrac()
{
char x;
cout << "Enter a Numerator and a Denominator of a Fraction: ";
cin >> n >> x >> d;

}
void fracType::showFrac() const
{
cout << "The Option you have choosen has Equaled: "
<< fn << "/" << fd;
}




int main()
{
int c;
fracType x0, x1, ADD, SUB, MULT, DIV;



cout << setw(30) << "Fraction Calculation Menu: \n";

cout << setw(5) << "1 -- ADDITION \n"
<< setw(5) << "2 -- SUBTRACTION \n"
<< setw(5) << "3 -- MULTIPLICATION \n"
<< setw(5) << "4 -- DIVISION \n"
<< setw(5) << "5 -- EXIT \n"
<< setw(5) << "Enter a Number of 1-5: ";
cin >> c;
x0.setFrac();
x1.setFrac();
if(c == 1)
{
ADD.add(x0,x1);
ADD.showFrac();
}
else if (c == 2)
{
SUB.subtract(x0,x1);
SUB.showFrac();
}
else if (c == 3)
{
MULT.multiply(x0,x1);
MULT.showFrac();
}
else if (c == 4)
{
DIV.divide(x0,x1);
DIV.showFrac();
}
else if (c == 5)
{
cout << "Good Bye";
_getch();
}
else
{
cout << "Enter valid menu choice: ";
cin >> c;
}

_getch ();
return 0;
}