private bool ReplaceWithSubtotal(int subtotal, int index)
{
calcArgsList.RemoveAt(index + 1);
calcArgsList.RemoveAt(index);
calcArgsList.RemoveAt(index - 1);
CalculatorArgument newArg = new CalculatorArgument(index - 1, subtotal.ToString());
calcArgsList.Insert(index - 1, newArg);
return(true);
}
/// <summary>
/// Perform Divide Multiply math operations (* /) first then Add Subtract (+ -) operations next
/// If we already did /* operation, removed the existing arguments and inserted the result
/// then we have to shift the index down by 2 to get to the next arguments that need to be
/// operated on
/// </summary>
/// <returns> Returns the Integer result of the calculation </returns>
public int calculateResult()
{
printCalcArgsList("Before");
bool wasReplaced = false;
foreach (KeyValuePair <int, string> element in divMulOps)
{
int index = 0;
if (wasReplaced)
{
index = element.Key - 2;
}
else
{
index = element.Key;
}
string multDivOp = element.Value;
CalculatorArgument argNum1 = calcArgsList[index - 1];
CalculatorArgument argNum2 = calcArgsList[index + 1];
//do * or / operations
int subtotal = PerformCalculation(multDivOp, argNum1.GetNumber(), argNum2.GetNumber());
//Put result of * or / operations back in with ALL args list
wasReplaced = ReplaceWithSubtotal(subtotal, index);
}
printCalcArgsList("After*/");
// What remains in the sorted list are the addition and subtraction operations
int calcArgsListSize = calcArgsList.Count() + 1;
for (int i = 1; i <= (calcArgsListSize / 3); i++)
{
int num1 = calcArgsList.ElementAt(0).GetNumber();
string oper = calcArgsList.ElementAt(1).GetOperator();
int num2 = calcArgsList.ElementAt(2).GetNumber();
int subtotal = PerformCalculation(oper, num1, num2);
wasReplaced = ReplaceWithSubtotal(subtotal, 1);
}
// For debug purposes only
printCalcArgsList("After+-");
int total = calcArgsList.ElementAt(0).GetNumber();
return(total);
}
/// <summary>
/// Constructor that creates class objects of the type CalculatorArgument and saves
/// them in a list for later access.
/// </summary>
public Calculator()
{
int position = 0;
foreach (KeyValuePair <int, string> element in calcArgsStr)
{
CalculatorArgument calcArg = new CalculatorArgument(position, element.Value);
if (calcArg.IsMultDivOp())
{
divMulOps.Add(position, element.Value);
}
calcArgsList.Insert(position, calcArg);
position += 1;
}
}