public void ExpressionTest()
{
// (10 + 20) * 30 / 40
var e1 = new ValueExpression(10);
var e2 = new ValueExpression(20);
var e3 = new ValueExpression(30);
var e4 = new ValueExpression(40);
Expression expression =
new DivisionBinaryExpression(
new MultiplicationBinaryExpression(
new AdditionBinaryExpression(e1, e2), e3), e4);
var solution = expression.Solve();
Assert.That(solution, Is.EqualTo(22.5));
}
private static Expression Subtraction(IReadOnlyList<string> expression)
{
for (var index = 0; index < expression.Count; index++)
{
if (expression[index] == "-")
{
var value1 = decimal.Parse(expression[index - 1]);
var value2 = decimal.Parse(expression[index + 1]);
var expression1 = new ValueExpression(value1);
var expression2 = new ValueExpression(value2);
return new SubtractionBinaryExpression(expression1, expression2);
}
}
return null;
}