public class Rational
	{
		private int m_Up = 0;
		private int m_Down = 1;

		public float Value { get => (float)m_Up / m_Down; }

		public Rational() { }
		public Rational(int up) { m_Up = up; }
		public Rational(int up, int down)
		{
			if (down == 0)
			{
				MessageBox.Show("division by zero, value = default");
				return;
			}
			m_Up = up; m_Down = Math.Abs(down);
		}

		static public Rational operator+ (Rational r1)
		{
			return new Rational(+r1.m_Up, +r1.m_Down);
		}

		static public Rational operator- (Rational r1)
		{
			return new Rational(-r1.m_Up, -r1.m_Down);
		}

		#region DefaultMath
		static public Rational operator+ (Rational r1, Rational r2)
		{
			return new Rational(r1.m_Up + r2.m_Up, r1.m_Down + r2.m_Down);
		}

		static public Rational operator- (Rational r1, Rational r2)
		{
			return new Rational(r1.m_Up - r2.m_Up, r1.m_Down - r2.m_Down);
		}

		static public Rational operator* (Rational r1, Rational r2)
		{
			return new Rational(r1.m_Up * r2.m_Up, r1.m_Down * r2.m_Down);
		}

		static public Rational operator/ (Rational r1, Rational r2)
		{
			return new Rational(r1.m_Up / r2.m_Up, r1.m_Down / r2.m_Down);
		}
		#endregion

		#region MathWithInt
		static public Rational operator +(Rational r1, int i2)
		{
			return r1 + new Rational(i2);
		}

		static public Rational operator -(Rational r1, int i2)
		{
			return r1 - new Rational(i2);
		}

		static public Rational operator *(Rational r1, int i2)
		{
			return r1 * new Rational(i2);
		}

		static public Rational operator /(Rational r1, int i2)
		{
			return r1 / new Rational(i2);
		}
		#endregion

		static public implicit operator float (Rational r1)
		{
			return r1.Value;
		}

		static public implicit operator string(Rational r1)
		{
			return $"Value = {r1.Value} Denominator = {r1.m_Up} Denominator = {r1.m_Down}";
		}
	}