Scientific Calculator
This is my first android app with a realistic use case, a scientific calculator
I made while taking COMP2161 at TRU. With the permission of Musfiq Rahman, My professor
in that course, I am sharing this as a portfolio project. To test the app yourself or
see the source code, head over to my
GitHub
to download the .apk file or Android Studio project.
There isn't much to say about this one - It's a scientific calculator with a light/dark mode.
It shows the completed operations at the top, followed buy the latest value, and has trig
functions, deg/rad, pos/ negative numbers, etc. I made this app in Android Studio using Java.
Use & Function:
The user can toggle system states using the light/dark button, rad/deg button, or store a value M
for later use using the set M button. The listener functions for these in MainActivity.java set the
relevant variables and update the view as needed.
The user puts their input in using the number buttons, the trig functions buttons, pi or saved value
buttons, decimal buttons, etc, and the program stores the input as a string that is added to for each
input given by the listeners for these buttons.
The clear button removes current value and function input, and the clear all resets the whole equation.
The +/- button can be used to change the sign of the input.
When the user clicks equals or a button for another operation, the program checks if the input is valid,
and if it is, it calls the evaluate() method, which applies the necessary operation and displays the output.
What could be improved here?
1: Add exponents & roots. This would be similar to using the trig functions, but would check for previous
inputs and values.
2: Add some type of value restriction. I didn't bother with restricting what values can be put into the calculator,
but it might be worth looking into max/min values.
3: Add inverse trig functions.
4: Add the ability to input fractions, as well as display output as well formatted fractions.