public void MultiplicationExpressionEvaluatesDifferenceOfComplexDecimalExpression()
{
// 3 / x - 7 + x / 2
IExpression three = new Constant(3);
IExpression x = new VariableX();
IExpression seven = new Constant(7);
IExpression two2 = new Constant(2);
IExpression result = new DivideExpression(three, x);
result = new SubtractionExpression(result, seven);
result = new SumExpression(result, x);
result = new DivideExpression(result, two2);
Context c = new Context(0.5);
var y = result.Interpret(c);
Assert.AreEqual(-0.25, y, 1e-10);
c = new Context(1.5);
y = result.Interpret(c);
Assert.AreEqual(-1.75, y, 1e-10);
}
public void MultiplicationExpressionEvaluatesDifferenceOf2Constants()
{
IExpression leftConstant = new Constant(10);
IExpression rightConstant = new Constant(4);
IExpression difference = new DivideExpression(leftConstant, rightConstant);
Context context = new Context(0);
var result = difference.Interpret(context);
Assert.AreEqual(2.5, result, 1e-10);
}