Calculator

As the title explains this is app is a calculator that with basic functionalities. It's not a scientific calculator, it's just my starting point in the world of Android Development.
I have only tested this application of mobile phone and not tablets because the app is meant for mobile phones only.
Features:
Click on the numbers to create a number.
Click on an operator to do operations (The operator will lock to show you what operator is being used).
You can only do one operation at the time so if you want to unlock an operator just click on the delete button.
To Reset hold down the delete button (AC function)
The "to the power" button works like an operator.
If you want to get the result then press the equal button.
If you want to use the result you last got then click the "ANS" button for the last answer.
Last but not least, if you want your number to be a negative number start the number by holding down the "-" operator.
I hope you enjoy the app.
Feel free to email me for any feedback and happy calculations.