public void CalculatorButtonClicked(object keyData)
{
CalculatorKeyData calculatorKeyData = (CalculatorKeyData)keyData;
var value = calculatorKeyData.KeyName;
if (operationStringArr.Any(x => ResultString.EndsWith(x) && ResultString.EndsWith(value)))
{
return;
}
if (value == "C")
{
ResultString = "0";
return;
}
if (ResultString == "0" || ResultString == "E")
{
ResultString = "";
}
//restricts the calculator input to max of 15 character length
if (ResultString.Length >= 15 && !operationStringArr.Any(x => ResultString.Contains(x)))
{
return;
}
else if (ResultString.Length >= 15 && value != "=")
{
return;
}
ResultString += Convert.ToString(value);
if (value == "=")
{
try{
ResultString = new DataTable().Compute(ResultString.TrimEnd('='), null).ToString();
}
catch (Exception ex) {
//returns error to user if any operation in the screen results in and error during parsing and computation
ResultString = "E";
}
}
}
private void InitializeKeys()
{
CalculatorKeyData calculatorData0 = new CalculatorKeyData()
{
KeyName = "0"
};
CalculatorKeyData calculatorData1 = new CalculatorKeyData()
{
KeyName = "1"
};
CalculatorKeyData calculatorData2 = new CalculatorKeyData()
{
KeyName = "2"
};
CalculatorKeyData calculatorData3 = new CalculatorKeyData()
{
KeyName = "3"
};
CalculatorKeyData calculatorData4 = new CalculatorKeyData()
{
KeyName = "4"
};
CalculatorKeyData calculatorData5 = new CalculatorKeyData()
{
KeyName = "5"
};
CalculatorKeyData calculatorData6 = new CalculatorKeyData()
{
KeyName = "6"
};
CalculatorKeyData calculatorData7 = new CalculatorKeyData()
{
KeyName = "7"
};
CalculatorKeyData calculatorData8 = new CalculatorKeyData()
{
KeyName = "8"
};
CalculatorKeyData calculatorData9 = new CalculatorKeyData()
{
KeyName = "9"
};
CalculatorKeyData calculatorData10 = new CalculatorKeyData()
{
KeyName = "+"
};
CalculatorKeyData calculatorData11 = new CalculatorKeyData()
{
KeyName = "-"
};
CalculatorKeyData calculatorData13 = new CalculatorKeyData()
{
KeyName = "*"
};
CalculatorKeyData calculatorData14 = new CalculatorKeyData()
{
KeyName = "/"
};
CalculatorKeyData calculatorData12 = new CalculatorKeyData()
{
KeyName = "="
};
CalculatorKeyData calculatorData15 = new CalculatorKeyData()
{
KeyName = "C"
};
Keys.Add(calculatorData1);
Keys.Add(calculatorData2);
Keys.Add(calculatorData3);
Keys.Add(calculatorData4);
Keys.Add(calculatorData5);
Keys.Add(calculatorData6);
Keys.Add(calculatorData7);
Keys.Add(calculatorData8);
Keys.Add(calculatorData9);
Keys.Add(calculatorData0);
Keys.Add(calculatorData10);
Keys.Add(calculatorData11);
Keys.Add(calculatorData13);
Keys.Add(calculatorData14);
Keys.Add(calculatorData15);
Keys.Add(calculatorData12);
}