// This method is used for adding and calculating the Pi and E number
private void AddPiE(string value)
{
// Check if there is operator or not and then adding value to number 1 or 2
int index = @operator == null ? 0 : 1;
// Jump into the CheckerActivity class to check the input
if (CheckerActivity.IsInputValid(numbers, index, value))
{
numbers[index] = value;
Calculate();
}
UpdateCalculatorText();
}
// This method is used for adding numbers or decimal point to the text view
private void AddDigitOrDecimalPoint(string value)
{
// Check if there is operator or not and then adding value to number 1 or 2
int index = @operator == null ? 0 : 1;
// Jump into the CheckerActivity class to check the input
if (CheckerActivity.IsInputValid(numbers, index, value))
{
// Check if user press equal or not
// If user pressed equal and entered new number,
// it will automaticall replace the old number to the new one
if (this._justPressEqual)
{
numbers[index] = value;
}
else
{
numbers[index] += value;
}
}
UpdateCalculatorText();
}
// This method will calculate all operations
private void Calculate(string newOperatorFunction = null)
{
double?result = null;
double?first = CheckerActivity.ParseValue(numbers[0]);
double?second = CheckerActivity.ParseValue(numbers[1]);
// Check if the text view already contained operation
// It will calculate first and then jump into the condition for function
if (first != null && @operator != null && second != null)
{
switch (@operator)
{
case "÷":
result = first / second;
break;
case "×":
result = first * second;
break;
case "+":
result = first + second;
break;
case "-":
result = first - second;
break;
}
}
if (result != null)
{
switch (@function)
{
case "Sin":
result = Math.Sin((double)result);
break;
case "Cos":
result = Math.Cos((double)result);
break;
case "Tan":
result = Math.Tan((double)result);
break;
case "Log":
result = Math.Log10((double)result);
break;
case "In":
result = Math.Log((double)result);
break;
case "%":
result = (double)result / ConstantContainer.percent;
break;
case "!":
result = CheckerActivity.CalculateRecursion(result);
break;
}
}
else
{
switch (@function)
{
case "Sin":
result = Math.Sin((double)first);
break;
case "Cos":
result = Math.Cos((double)first);
break;
case "Tan":
result = Math.Tan((double)first);
break;
case "Log":
result = Math.Log10((double)first);
break;
case "In":
result = Math.Log((double)first);
break;
case "%":
result = (double)first / ConstantContainer.percent;
break;
case "!":
result = CheckerActivity.CalculateRecursion(first);
break;
}
}
// Check if the result null or not and then check if the firt number is valid or not and get the second instead
if (result == null)
{
result = first ?? second;
}
if (result != null)
{
double?finalResult = Math.Round((double)result, 8);
numbers[0] = finalResult.ToString();
@operator = newOperatorFunction;
@function = newOperatorFunction;
numbers[1] = null;
UpdateCalculatorText();
}
}