Simple Calculator

This is a completely free app. No ads. Super easy-to-use. It mimics old-style scientific calculator to display equation at the top.

Features:
- equation navigation buttons to move the cursor in the equation to the left or right
- delete button to remove the math symbol before the cursor
- normal add, subtract, multiply, divide operations
- "Ans" button to use the previous answer in the current equation
- advanced math operations like parenthesis and exponentiation

** TO DEVELOPERS **
This app is completely open-source. To see how it works, here is the source code:
https://github.com/lcnssamlcn/simple_calc