private void buttonEqual_Click(object sender, EventArgs e)
{
String calcResult = getCalculationResult(); //string to hold the results of the calculation
//if the user has selected to use the refactored calculator
if (checkRefactoredCalculator.Checked == true)
{
//if the ressult returned by the calculation is not the same as the result stored by the calculator
if (calcResult == refactoredCalculator.getResult())
{
calculatorDisplayBox.Text = calcResult;
buttonUndo.Enabled = true; //set the undo button to be enabled
buttonRedo.Enabled = false; //set the redo button to be disabled
index = 0; //set the history index to 0
}
else
{
calculatorDisplayBox.Text = calcResult;
}
}
//if the user has selected to use the simple calculator
else
{
//if the ressult returned by the calculation is not the same as the result stored by the calculator
if (simpleCalculator != null && calcResult == simpleCalculator.getResult())
{
calculatorDisplayBox.Text = calcResult;
buttonUndo.Enabled = true; //set the undo button to be enabled
buttonRedo.Enabled = false; //set the redo button to be disabled
index = 0; //set the history index to 0
}
else
{
calculatorDisplayBox.Text = calcResult;
}
}
//focus on the calculatorDisplayBox and set the cursor to the end
calculatorDisplayBox.Focus();
calculatorDisplayBox.SelectionStart = calculatorDisplayBox.TextLength;
calculatorDisplayBox.SelectionLength = 0;
}
//private method to get the calculation results from the calculator
private String getCalculationResult()
{
List <String> input = parseInput();
//if the input is not empty
if (input.Count != 0)
{
//if the user has specified they are using the simple calculator
if (checkRefactoredCalculator.Checked == false)
{
//if the input contains all 3 parts: (number operator number)
if (input.Count == 3)
{
//if the simpleCalculator has not been initiated yet
if (simpleCalculator == null)
{
simpleCalculator = new Calculator(input[0], input[2], input[1]); //call the constructor
simpleCalculator.calculate(); //calculate the result
return(simpleCalculator.getResult()); //return the result
}
else
{
simpleCalculator.setLeft(input[0]); //set the left operand
simpleCalculator.setOperator(input[1]); //set the operator
simpleCalculator.setRight(input[2]); //set the right operand
simpleCalculator.calculate(); //calculate the result
return(simpleCalculator.getResult()); //return the result
}
}
//if the input only contains 2 parts: (number operator) or (operator number)
else if (input.Count == 2)
{
//if the simpleCalculator has not been initiated yet
if (simpleCalculator == null)
{
simpleCalculator = new Calculator(input[0], "", input[1]); //call the constructor
simpleCalculator.calculate(); //calculate the result
return(simpleCalculator.getResult()); //return the result
}
else
{
simpleCalculator.setLeft(input[0]); //set the left operand
simpleCalculator.setOperator(input[1]); //set the operator
simpleCalculator.setRight(""); //set the right operand to be an empty string
simpleCalculator.calculate(); //calculate the result
return(simpleCalculator.getResult()); //return the result
}
}
//if the input only contains one part
else if (input.Count == 1)
{
/*
* //if the simpleCalculator has not been initiated yet
* if (simpleCalculator == null)
* {
* simpleCalculator = new Calculator(input[0], "", ""); //call the constructor
* simpleCalculator.calculate(); //calculate the result
* return simpleCalculator.getResult(); //return the result
* }
* else
* {
* simpleCalculator.setLeft(input[0]); //set the left operand
* simpleCalculator.setOperator(""); //set the operator to be an empty string
* simpleCalculator.setRight(""); //set the right operand to be an empty string
* simpleCalculator.calculate(); //calculate the reuslt
* return simpleCalculator.getResult(); //return the result
* }*/
}
//if the input is longer than the basic formula
else
{
//check for a failed scientific notation
foreach (String str in input)
{
if (str[str.Length - 1] == 'E')
{
for (int i = 0; i < str.Length - 1; i++)
{
if (!Char.IsDigit(str[i]) && str[i] != '+' && str[i] != '-' && str[i] != '*' && str[i] != '/' && str[i] != '.')
{
return(String.Format("Error: \"{0}\" is not a number", str));
}
}
}
}
return("Error: Too many arguments");
}
}
//if the user has specified they are using the refactored calculator
else
{
return(refactoredCalculator.calculate(input)); //return the result of the calculation
}
}
return(calculatorDisplayBox.Text);
}