public void ConvertShouldConvertToReversePolishNotation()
{
var input = new[] // 3 + 4 * 2 / (1 - 5)^2
{
InputCell.Number(3),
InputCell.Symbol("+"),
InputCell.Number(4),
InputCell.Symbol("*"),
InputCell.Number(2),
InputCell.Symbol("/"),
InputCell.Symbol("("),
InputCell.Number(1),
InputCell.Symbol("-"),
InputCell.Number(5),
InputCell.Symbol(")"),
InputCell.Symbol("^"),
InputCell.Number(2),
};
var result = new RpnConverter(new InputChecker()).Convert(input);
// 3 4 2 * 1 5 - 2 ^ / +
Assert.AreEqual(3, result[0].Value);
Assert.AreEqual(4, result[1].Value);
Assert.AreEqual(2, result[2].Value);
Assert.AreEqual("*", result[3].Value);
Assert.AreEqual(1, result[4].Value);
Assert.AreEqual(5, result[5].Value);
Assert.AreEqual("-", result[6].Value);
Assert.AreEqual(2, result[7].Value);
Assert.AreEqual("^", result[8].Value);
Assert.AreEqual("/", result[9].Value);
Assert.AreEqual("+", result[10].Value);
}
public void IsOperationShouldReturnTrue()
{
Assert.IsTrue(InputCell.Symbol("+").IsOperation());
Assert.IsTrue(InputCell.Symbol("-").IsOperation());
Assert.IsTrue(InputCell.Symbol("*").IsOperation());
Assert.IsTrue(InputCell.Symbol("/").IsOperation());
Assert.IsTrue(InputCell.Symbol("^").IsOperation());
}
public void WeightShouldReturnCorrectWeigth()
{
Assert.AreEqual(0, InputCell.Number(1).Weight);
Assert.AreEqual(1, InputCell.Symbol(")").Weight);
Assert.AreEqual(1, InputCell.Symbol("(").Weight);
Assert.AreEqual(2, InputCell.Symbol("+").Weight);
Assert.AreEqual(2, InputCell.Symbol("-").Weight);
Assert.AreEqual(3, InputCell.Symbol("*").Weight);
Assert.AreEqual(3, InputCell.Symbol("/").Weight);
Assert.AreEqual(4, InputCell.Symbol("^").Weight);
}
public void CheckShouldThrowExceptionIfThereIsOpeartionsInLastCell()
{
var input = new[]
{
InputCell.Number(2),
InputCell.Symbol("+"),
InputCell.Number(2),
InputCell.Symbol("+")
};
Assert.Throws <ArgumentException>(() =>
new InputChecker().Check(input));
}
public void CountShouldReturn3Dot5()
{
// 3 + 4 * 2 / (1 - 5)^2 = 3.5
// 3 4 2 * 1 5 - 2 ^ / +
var input = new[]
{
InputCell.Number(3),
InputCell.Number(4),
InputCell.Number(2),
InputCell.Symbol("*"),
InputCell.Number(1),
InputCell.Number(5),
InputCell.Symbol("-"),
InputCell.Number(2),
InputCell.Symbol("^"),
InputCell.Symbol("/"),
InputCell.Symbol("+")
};
var result = new RpnCounter().Count(input);
Assert.AreEqual(3.5, result);
}
public void SymbolShouldTrowExceptionInputContainsInvalidSymbols()
{
Assert.Throws <ArgumentException>(() => InputCell.Symbol("$"));
Assert.Throws <ArgumentException>(() => InputCell.Symbol("1"));
Assert.Throws <ArgumentException>(() => InputCell.Symbol("a"));
}
public void IsNumberShouldReturnFalse()
{
Assert.IsFalse(InputCell.Symbol(")").IsNumber());
}
public void IsOperationShouldReturnFalse()
{
Assert.IsFalse(InputCell.Symbol("(").IsOperation());
Assert.IsFalse(InputCell.Symbol(")").IsOperation());
}