protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
TextView display = FindViewById <TextView>(Resource.Id.display);
Button number0 = FindViewById <Button>(Resource.Id.number0);
Button number1 = FindViewById <Button>(Resource.Id.number1);
Button number2 = FindViewById <Button>(Resource.Id.number2);
Button number3 = FindViewById <Button>(Resource.Id.number3);
Button number4 = FindViewById <Button>(Resource.Id.number4);
Button number5 = FindViewById <Button>(Resource.Id.number5);
Button number6 = FindViewById <Button>(Resource.Id.number6);
Button number7 = FindViewById <Button>(Resource.Id.number7);
Button number8 = FindViewById <Button>(Resource.Id.number8);
Button number9 = FindViewById <Button>(Resource.Id.number9);
Button dot = FindViewById <Button>(Resource.Id.dot);
Button add = FindViewById <Button>(Resource.Id.add);
Button subtract = FindViewById <Button>(Resource.Id.subtract);
Button multiply = FindViewById <Button>(Resource.Id.multiply);
Button divide = FindViewById <Button>(Resource.Id.divide);
Button sign = FindViewById <Button>(Resource.Id.sign);
Button percent = FindViewById <Button>(Resource.Id.percent);
Button equal = FindViewById <Button>(Resource.Id.equal);
Button clear = FindViewById <Button>(Resource.Id.clear);
Button delete = FindViewById <Button>(Resource.Id.delete);
display.Text = "0";
string displayedNumber = string.Empty;
string firstNumber = string.Empty;
string secondNumber = string.Empty;
string operand = string.Empty;
string formula = string.Empty;
number0.Click += (object sender, EventArgs e) =>
{
displayedNumber = "0";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number1.Click += (object sender, EventArgs e) =>
{
displayedNumber = "1";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number2.Click += (object sender, EventArgs e) =>
{
displayedNumber = "2";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number3.Click += (object sender, EventArgs e) =>
{
displayedNumber = "3";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number4.Click += (object sender, EventArgs e) =>
{
displayedNumber = "4";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number5.Click += (object sender, EventArgs e) =>
{
displayedNumber = "5";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number6.Click += (object sender, EventArgs e) =>
{
displayedNumber = "6";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number7.Click += (object sender, EventArgs e) =>
{
displayedNumber = "7";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number8.Click += (object sender, EventArgs e) =>
{
displayedNumber = "8";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
number9.Click += (object sender, EventArgs e) =>
{
displayedNumber = "9";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
dot.Click += (object sender, EventArgs e) =>
{
displayedNumber = ".";
if (display.Text == "0")
{
display.Text = displayedNumber;
}
else
{
display.Text = display.Text + displayedNumber;
}
};
percent.Click += (object sender, EventArgs e) =>
{
string result = Calculator.Percent(display.Text);
display.Text = result;
};
sign.Click += (object sender, EventArgs e) =>
{
if (display.Text.EndsWith(")"))
{
string tempText = display.Text;
tempText = tempText.Remove(tempText.IndexOf("("), 1);
tempText = tempText.Remove(tempText.IndexOf("-"), 1);
tempText = tempText.Remove(tempText.IndexOf(")"), 1);
display.Text = tempText;
}
else
{
displayedNumber = "(-";
int lastIndex = display.Text.LastIndexOf(' ');
string newText = display.Text.Insert(lastIndex + 1, displayedNumber);
int textLength = newText.Length;
newText = newText.Insert(textLength, ")");
display.Text = newText;
}
};
/* MISTAKES I HAD COMMITED EARLIER */
add.Click += (object sender, EventArgs e) =>
{
display.Text = display.Text + " + ";
/*operand = "-";
* firstNumber = display.Text;
* display.Text = String.Empty;
*/
};
subtract.Click += (object sender, EventArgs e) =>
{
display.Text = display.Text + " - ";
/*operand = "-";
* firstNumber = display.Text;
* display.Text = String.Empty;
*/
};
multiply.Click += (object sender, EventArgs e) =>
{
display.Text = display.Text + " * ";
/*operand = "x";
* firstNumber = display.Text;
* display.Text = String.Empty;
*/
};
divide.Click += (object sender, EventArgs e) =>
{
display.Text = display.Text + " / ";
/*operand = "/";
* firstNumber = display.Text;
* display.Text = String.Empty;
*/
};
clear.Click += (object sender, EventArgs e) =>
{
//firstNumber = String.Empty;
//secondNumber = String.Empty;
display.Text = "0";
};
delete.Click += (object sender, EventArgs e) =>
{
if (display.Text.Length == 0)
{
display.Text = "0";
}
else if (display.Text.Contains("+") || display.Text.Contains("-") || display.Text.Contains("*") || display.Text.Contains("/"))
{
int length = display.Text.Length;
display.Text = display.Text.Remove(length - 1);
display.Text = display.Text.Remove(length - 2);
}
else
{
int length = display.Text.Length;
display.Text = display.Text.Remove(length - 1);
}
};
equal.Click += (object sender, EventArgs e) =>
{
try
{
Expression ex = new Expression(display.Text);
if (!ex.HasErrors())
{
display.Text = Convert.ToString(ex.Evaluate());
}
}
catch (EvaluationException)
{
display.Text = "Error";
}
catch (OverflowException)
{
display.Text = "Overflow Error";
}
catch (DivideByZeroException)
{
display.Text = "Cannot Divide by Zero";
}
/*if (operand == "+")
* {
* Expression e = new Expression(display.Text);
*
* }
* else if (operand == "-")
* {
* secondNumber = display.Text;
* display.Text = Calculator.Difference(firstNumber, secondNumber);
* firstNumber = secondNumber;
* }
* else if (operand == "x")
* {
* secondNumber = display.Text;
* display.Text = Calculator.Product(firstNumber, secondNumber);
* firstNumber = secondNumber;
* }
* else if (operand == "/")
* {
* secondNumber = display.Text;
* display.Text = Calculator.Division(firstNumber, secondNumber);
* firstNumber = secondNumber;
* }*/
};
}