/*
	Programmer:  Christopher S. Dixon
	Prof:  Dr. Zizhong Wang
	Procedure:  This program is designed to take two fractions that are inputted by the user in 
		    the format (numerator)/(denominator) and calculate them using addition, subtraction, 
                    multiplication, or division, the process is also decided by user input (+, -, *, /).
	Compile(in linux environment): g++ clemsoncode2.cpp
	Execute(in linux environment): ./a.out
*/

#include <iostream>

using namespace std;

class Fraction
{
	int num;
	int den;
public:
	Fraction()
	// default fraction is 0/1
	{
		num=0;
		den=1;
	}

	Fraction(int n, int d)
	{
		num=n; 
		den=d;
	}

	//Function for Setting Numerator and Denominator
	
	void Set(int n, int d)
	{
		num=n;
		den=d;
	}
	
	//Function for Outputting Fraction Solution

	void Print() const 
	{
		cout<<num<<"/"<<den;
	}

	//Function Procedure for Addition

	Fraction Add (Fraction x)
	{
		Fraction answer;
		int n;
		int d;
		d = Fraction :: den * x.den;
		n = num * x.den + den*x.num;
		answer.Set(n,d);
		return answer;
	}

	//Funtion Procedure for Subtraction

	Fraction Sub (Fraction x)
	{
		Fraction answer;
                int n;
		int d;
                d = Fraction :: den * x.den;
                n = num * x.den -  den*x.num;
                answer.Set(n,d);
                return answer;
	}

	//Function Procedure for Multiplication

	Fraction Mult (Fraction x)
	{
		Fraction answer;
		int n;
		int d;
		n = num*x.num;
		d = den*x.den;
		answer.Set(n,d);
                return answer;
	}

	//Function Procedure for Division	

	Fraction Div (Fraction x)	
	{
		Fraction answer;
                int n;
		int d;
                n = num/x.num;
                d = den/x.den;
                answer.Set(n,d);
                return answer;
	}
};

int main()
{
	//Initialize numerator and denominator
	int nu;
	int de;
	//Create dummy variable for "/" sign
	char dummy;
	//Create space for operation sign input
	char op;
	//Create Fraction 1
	Fraction x;
	//Create Fraction 2
	Fraction y;
	//Create Fraction 3
	Fraction z;
	cout<< "*******************************************"<< endl;
	cout<< "*           Thank you for using           *"<< endl;
	cout<< "*       my fraction program please        *"<<endl;
	cout<<"* Input Fraction 1: (-1/1 or 1/1 to quit) *"<<endl;
	cout<< "* ";

	//User input for fraction 1
	cin>>nu>>dummy>>de;
	
	while (nu!=(-1) && de!=1)
	{
		//Set Fraction 1
		x.Set(nu,de);
		cout<<"* Input Fraction 2:                       * "<<endl;
		//User Input for fraction 2
		cout<< "* ";
		cin>>nu>>dummy>>de;
		//Set Fraction 2
		y.Set(nu,de);
		cout<<"* Input the operation:                    * "<<endl;
		cout<<"* ";
		//Select operation for program to run
		cin>>op;

		//If Operation selected is addition call Addition Function
		if (op=='+')
                {
                        z=x.Add(y);
			cout<< "* ";
                        x.Print();
			cout<<" + ";
			y.Print();
			cout<<" = ";
			z.Print();
                }

		//If Operation selected is subtraction call Subtraction Function
	        else if (op=='-')
                {
                        z=x.Sub(y);
			cout <<"* ";
                        x.Print();
                        cout<<" - ";
                        y.Print();
                        cout<<" = ";                    
                        z.Print();
                }

		//If Operation selected is multiplication call Multiplication Function
	        else if (op=='*')
                {
                        z=x.Mult(y);
			cout << "* ";
                        x.Print();
                        cout<<" * ";
                        y.Print();
                        cout<<" = ";                    
                        z.Print();
                }

		//If Operation selected is division call Division Function
		else if (op=='/')
                {
                        z=x.Div(y);
			cout << "* ";
                        x.Print();
                        cout<<" / ";
                        y.Print();
                        cout<<" = ";                    
                        z.Print();
                }
		else

		//If Operation selected is not a known math operation
		cout<<"* This is not a valid operation. *"<<endl;	
		cout<<"\n* Input Fraction 1: (-1/1 or 1/1 to quit) *"<<endl;
		cout<<"* ";
		cin>>nu>>dummy>>de;
	}
	cout<<"*                                         *"<<endl;
	cout<<"*                                         *"<<endl;
	cout<<"*            Thank you for using          *"<<endl;
	cout<<"*            my fraction program          *"<<endl;
	cout<<"*******************************************"<< endl;
	return 0;	
}