public class Rational
	{
		private int m_Denominator = 0;
		private int m_Divider = 1;

		public float Value { get => (float)m_Denominator / m_Divider; }

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

		static public Rational operator+ (Rational r1)
		{
			return new Rational(+r1.m_Denominator, +r1.m_Divider);
		}

		static public Rational operator- (Rational r1)
		{
			return new Rational(-r1.m_Denominator, -r1.m_Divider);
		}

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

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

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

		static public Rational operator/ (Rational r1, Rational r2)
		{
			return new Rational(r1.m_Denominator / r2.m_Divider, r1.m_Divider / r2.m_Denominator);
		}
		#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_Denominator} Divider = {r1.m_Divider}";
		}
	}