public string Calculate(string input)
{
// creates a new RegexProcessor
RegexUtil regexProcessing = new RegexUtil();
// creates a new setting ConstantParser
ConstantParser constantSetting = new ConstantParser();
// extract integers
ArrayList integers = regexProcessing.ExtractNums(input);
// extracts operand
string thisOp = regexProcessing.ExtractsOp(input);
// holds answer value
string answer;
// make a new instance of the applicable class per the
// operand extracted
switch (thisOp)
{
case "+":
AddIt thisAddExp = new AddIt();
answer = thisAddExp.Addition(integers).ToString();
LastQnA.LastAns = Convert.ToInt32(answer);
LastQnA.LastQ = input;
return answer;
case "-":
SubtractIt thisSubExp = new SubtractIt();
answer = thisSubExp.Subtraction(integers).ToString();
LastQnA.LastAns = Convert.ToInt32(answer);
LastQnA.LastQ = input;
return answer;
case "*":
MultiplyIt thisMultiExp = new MultiplyIt();
answer = thisMultiExp.Multiplication(integers).ToString();
LastQnA.LastAns = Convert.ToInt32(answer);
LastQnA.LastQ = input;
return answer;
case "/":
DivideIt thisDivExp = new DivideIt();
answer = thisDivExp.Division(integers).ToString();
LastQnA.LastAns = Convert.ToInt32(answer);
LastQnA.LastQ = input;
return answer;
case "%":
ModIt thisModExp = new ModIt();
answer = thisModExp.Modulation(integers).ToString();
LastQnA.LastAns = Convert.ToInt32(answer);
LastQnA.LastQ = input;
return answer;
case "=":
answer = "Your value has been set";
return answer;
default: throw new ArgumentException("Input doesn't contain an operand understood {0}", thisOp);
}
}
// this is going to extract which type of expression it is
public string ExtractsOp(string input)
{
Match AddMatch = add_regex.Match(input);
Match DivideMatch = divide_regex.Match(input);
Match MultiMatch = multiply_regex.Match(input);
Match SubMatch = subt_regex.Match(input);
Match ModMatch = mod_regex.Match(input);
if (AddMatch.Success)
{
AddIt thisAdd = new AddIt();
return "+";
}
else if (SubMatch.Success)
{
SubtractIt thisSub = new SubtractIt();
return "-";
}
else if (MultiMatch.Success)
{
MultiplyIt thisMult = new MultiplyIt();
return "*";
}
else if (DivideMatch.Success)
{
DivideIt thisDiv = new DivideIt();
return "/";
}
else if (ModMatch.Success)
{
ModIt thisMod = new ModIt();
return "%";
}
else
{
throw new ArgumentException("No operator provided");
}
}
public void SubtractionTest()
{
SubtractIt testSubtract = new SubtractIt();
ArrayList myNums = new ArrayList();
myNums.Add(5);
myNums.Add(5);
int answer = testSubtract.Subtraction(myNums);
Assert.AreEqual(answer, 0);
}