public void TestIncompleteOperatorExpression()
{
const string testExpression = "1+";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestNonsenseStringExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be false");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 0");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsFalse(isValidExpression);
Assert.AreEqual(value, 0.0d);
}
public void TestSingleConstantExpression()
{
const string testExpression = "pi";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestSingleConstantExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 3.14159265358979");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, Math.PI);
}
public void TestCosineFunctionExpression()
{
const string testExpression = "COS(2)*2";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestCosineFunctionExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: -0.832293673094285");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, (Math.Cos(2) * 2));
}
public void TestLogFunctionExpression()
{
const string testExpression = "LOG(10^2,10)";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestLogFunctionExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 2");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, (Math.Log(100, 5 + 5)));
}
public void TestWhitespaceSeparatedExpression()
{
const string testExpression = " 1 + 1 ";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestWhitespaceSeparatedExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 2");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, (1 + 1));
}
public void TestSineFunctionExpression()
{
const string testExpression = "SIN(1+1)";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestSineFunctionExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 0.909297426825682");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, (Math.Sin(1 + 1)));
}
public void TestParentheseExpression()
{
const string testExpression = "(2+2)^(4/2)";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestParentheseExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 16");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, Math.Pow((2 + 2), (4d / 2d)));
}
public void TestExponentiateExpression()
{
const string testExpression = "2^4";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestExponentiateExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 16");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, (Math.Pow(2, 4)));
}
public void TestDivideExpression()
{
const string testExpression = "3/2";
var testTree = new ExpTree(testExpression);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestDividExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 1.5");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, (3d / 2d));
}
public void TestSingleVariableExpression()
{
const string testVarName = "a1";
const double testVarValue = 123.45d;
const string testExpression = testVarName;
var testTree = new ExpTree(testExpression);
testTree.SetVar(testVarName, testVarValue);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Console.WriteLine("TestSingleVariableExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: 123.45");
Console.WriteLine(" Actual value: {0}", value);
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, testVarValue);
}
//=====================================================================
// Menu3() -- evaluate the expression tree
//=====================================================================
private static void Menu3()
{
if (null != _expTree && null != _expStr)
{
if (_expTree.IsValidExpression())
{
string result = _expTree.Eval().ToString();
//Console.WriteLine(_expStr + " = " + result);
Console.WriteLine(result);
}
else
{
Console.WriteLine("Invalid expression");
}
}
else
{
Console.WriteLine("No expresion entered");
}
}
public void TestMultivariableExpression()
{
const string testVarName1 = "a1";
const string testVarName2 = "Z50";
const double testVarValue1 = 123.45d;
const double testVarValue2 = double.MaxValue;
const string testExpression = "a1-Z50";
var testTree = new ExpTree(testExpression);
testTree.SetVar(testVarName1, testVarValue1);
testTree.SetVar(testVarName2, testVarValue2);
var isValidExpression = testTree.IsValidExpression();
var value = testTree.Eval();
Assert.IsTrue(isValidExpression);
Assert.AreEqual(value, (testVarValue1 - testVarValue2));
Console.WriteLine("TestMultiVariableExpression:");
Console.WriteLine(" ExpTree.IsValidExpression() should be true");
Console.WriteLine(" IsValidExpression() returned {0}", isValidExpression);
Console.WriteLine(" Expected value: -1.79769313486232E+308");
Console.WriteLine(" Actual value: {0}", value);
}