public void IntegerFractionTest()
{
var f1 = new IntegerFraction(1, 2);
var f2 = new IntegerFraction(3, 5);
var f3 = new IntegerFraction(4, 8);
var f4 = new IntegerFraction(4, 2);
var f5 = new IntegerFraction(-2, 3);
var f6 = new IntegerFraction(-1, 6);
Assert.AreEqual("1/2", f1.ToString());
Assert.AreEqual("3/5", f2.ToString());
Assert.AreEqual("1/2", f3.ToString());
Assert.AreEqual("2", f4.ToString());
Assert.AreEqual("⁻2/3", f5.ToString());
Assert.AreEqual("11/10", (f1 + f2).ToString());
Assert.AreEqual("1", (f1 + f3).ToString());
Assert.AreEqual("5/2", (f1 + f4).ToString());
Assert.AreEqual("⁻1/6", (f1 + f5).ToString());
Assert.AreEqual("11/10", (f2 + f3).ToString());
Assert.AreEqual("13/5", (f2 + f4).ToString());
Assert.AreEqual("⁻1/15", (f2 + f5).ToString());
Assert.AreEqual("⁻1/10", (f1 - f2).ToString());
Assert.AreEqual("0", (f1 - f3).ToString());
Assert.AreEqual("⁻3/2", (f1 - f4).ToString());
Assert.AreEqual("7/6", (f1 - f5).ToString());
Assert.AreEqual("3/10", (f1 * f2).ToString());
Assert.AreEqual("1/4", (f1 * f3).ToString());
Assert.AreEqual("1", (f1 * f4).ToString());
Assert.AreEqual("⁻1/3", (f1 * f5).ToString());
Assert.AreEqual("1/9", (f5 * f6).ToString());
Assert.AreEqual("5/6", (f1 / f2).ToString());
Assert.AreEqual("1", (f1 / f1).ToString());
Assert.AreEqual("1", (f1 / f3).ToString());
Assert.AreEqual("1/4", (f1 / f4).ToString());
Assert.AreEqual("⁻3/4", (f1 / f5).ToString());
}
internal static bool IsIntegerFraction(Evaluatable evaluatable, out IntegerFraction fraction)
{
var component = Componentizer.ToComponent(evaluatable);
if (component is IntegerFraction)
{
fraction = (IntegerFraction)component;
return true;
}
var factor = Factorizer.ToFactor(evaluatable);
if (factor is NumericFactor)
{
var number = ((NumericFactor)factor).Number;
if (number is Integer)
{
fraction = new IntegerFraction((Integer)number);
return true;
}
}
fraction = null;
return false;
}
private static Expression Evaluate(IntegerFraction leftFraction, IntegerFraction rightFraction, bool leftIsNumerator, bool rightIsNumerator)
{
if (leftIsNumerator && rightIsNumerator)
{
return Expressionizer.ToExpression(leftFraction * rightFraction);
}
if (leftIsNumerator)
{
return NumberToExpression(leftFraction / rightFraction);
}
if (rightIsNumerator)
{
return NumberToExpression(rightFraction / leftFraction);
}
return NumberToExpression(leftFraction.Inverse * rightFraction.Inverse);
}