Thread: Overloading insertion and extraction problem

Im having a difficult time wondering why im having problems with my insertion (<<) and extraction (>>) operators. If anyone can help me out with this minor problem...it would be grateful. Thanks!

Code:

#include <math.h>         
#include <iostream.h>       
//using namespace std;

class Fraction   
{
	private:
		int denom;
		int numer;
		
	public:
		Fraction()
			{
				numer = 0;
				denom = 1;
			};
		Fraction(int n, int d)
			{
				numer = n;
				denom = d;
			};
		Fraction operator + (Fraction f2)
			{
				Fraction temp;
				temp.numer =  numer * f2.denom + denom * f2.numer;
				temp.denom =  denom * f2.denom;
				return temp;
			};
		Fraction operator - (Fraction f2)
			{
				Fraction temp;
				temp.numer =  numer * f2.denom - denom * f2.numer;
				temp.denom =  denom * f2.denom;
				return temp;
			};
		Fraction operator * (Fraction f2)
			{				
				Fraction temp;
				temp.numer =  numer * f2.numer;
				temp.denom =  denom * f2.denom;								
				return temp;
			};
		Fraction operator / (Fraction f2)
			{				 
				Fraction temp;
				temp.numer =  numer * f2.denom;
				temp.denom =  denom * f2.numer;				
				return temp;
			};		
		bool operator > (Fraction f1)
			{
				float temp = f1.numer / f1.denom;
				float temp1 = numer / denom;				
                return (temp > temp1) ? true:false;
			};
		bool operator < (Fraction f1)
			{
				float temp = numer / denom;
				float temp1 = f1.numer / f1.denom;
				return (temp < temp1) ? true:false;
			};
		bool operator == (Fraction f1)
			{
				if ((numer == f1.numer) && (denom == f1.denom))
					return 1;
				else
					return 0;
			}
		bool operator != (Fraction f1)
			{
				if ((numer != f1.numer) && (denom != f1.denom))
					return 1;
				else
					return 0;
			}
		void operator += (Fraction f1)
			{
				numer = numer + f1.numer;
				denom = denom + f1.denom;
			}
		void operator -= (Fraction f1)
			{
				numer = numer - f1.numer;
				denom = denom - f1.denom;
			}
		void operator *= (Fraction f1)
			{
				numer = numer * f1.numer;
				denom = denom * f1.denom;
			}
		void operator /= (Fraction f1)
			{
				numer = numer / f1.numer;
				denom = denom / f1.denom;
			}
		void lowTerms()
			{
				long rNumer, rDenom, temp, gcd;

				rNumer = labs(numer);
				rDenom = labs(denom);
				if (rDenom == 0)
					{
						cout<<"Illegal Fraction: division by 0"<<endl;
						return;
					}
				else if (rNumer == 0)
					{
						numer = 0;
						denom = 1;
						return;
					}
				while (rNumer != 0)
					{
						if (rNumer < rDenom)
							{
								temp = rNumer;
								rNumer = rDenom;
								rDenom = temp;						
							}
						rNumer -= rDenom;
					}
				gcd = rDenom;
				numer = numer / gcd;
				denom = denom / gcd;
			}				


};
friend istream& operator >> (istream& in, Fraction f1)
			{
				char slash;
				in>>numer;
				cin>>slash;
				in>>denom;
				return;
			}
friend ostream& operator << (ostream& out, Fraction f1)
			{
				out<<numer;
				cout<<"/";
				out<<denom;
				return out;
			}

void main()
{
   Fraction f1, f2, f3, f4;      
   char   slash = '/';
   char   op;
   char   valid_operator= 'y';
   char   another_try='y';

   cout << "\n-------- The four-function calculator ---------" << endl;
   do {
       cout << "\nEnter a fraction, an operator (+, -, *, /), and another fraction: "
               << "\n       (for example: 1/2 * 3/4)    ";         

		  cin >> f1 >> op >> f2;
		  switch (op)
              {
                  case '+':
                      f3 = f1 + f2;                   	 
					  f4 += f2;
					  break;

                  case '-':
                      f3 = f1 - f2;
					  f4 -= f2;
                      break;

                  case '*':
                      f3 = f1 * f2;
					  f4 *= f2;
                      break;

                  case '/':
                      f3 = f1 / f2;
					  f4 /= f2;
                      break;
                  default:
                      valid_operator = 'n';
                      break;
              }

	if (valid_operator == 'y')
        {
            cout << "       The result is "<<f3;
			if ( f1 < f2 )
				{							  	     
                    cout<<f1;
					cout << " is less than ";
					cout<<f2;
					cout << endl;
				}
			if ( f1 > f2 )
				{ 
					cout<<f1; 
					cout<<" is greater than ";
					cout<<f2;
					cout<<endl;
				}
			if ( f1 == f2 )
				{ 
					cout<<f1; 
					cout << " is equal to ";
					cout<<f2;
					cout << endl;
				}
			if ( f1 != f2 )
				{ 
					cout<<f1; 
					cout << " is not equal to ";
					cout<<f2;
					cout << endl;
				}

        } 
	if (valid_operator == 'y')
		{
			cout<< "       The result is ";
			f3.lowTerms();
			cout<<f3;
			cout<< "\n       The assignment operator result is: ";
			cout<<f4;
	    }
	else
		{
			cout << "       The operator must be +, -, *, or /. Try again! "  << endl;
			valid_operator = 'y';
		}
	cout << "       Do another calculation?  ";
	cin >> another_try;
	} while (another_try == 'y');

}