#ifndef DEF_ZFRACTION

	#define DEF_ZFRACTION
	#include <iostream>
	#include <string>
	
	using namespace std;


	class ZFraction{
		public:
			ZFraction(int a=1, int b=1);

			void toString()       const;

			ZFraction& operator+=(ZFraction const& operand);

		private:
			int a;
			int b;
	};




	#include "ZFraction.cpp"

#endif