Expression solver.
Original Comments from 2013-12-28
mathex™ Solver.
mathex™ Solver simplifies any mathematical expression. It can handle any number of nested brackets. Variables which have their predefined values can be used in the expression. Radix convertions from 2 to 36 including hexadecimal, octal and binary number systems are supported. Various functions including but not limited to sin(), cos(), ln() ... are supported.
I followed the rule "practice design, not decoration" rule to some extent. Tried to simplify the GUI to make the software more user-friendly. I used swing controls designing the GUI. Tooltips are used to guide the user to use the software. I used the html-like tag support for clarity.
Internally, I used a constructor which accepts the expression as a String and, a TreeMap of variables. I used a function called "selectAndSolve" which selects what operations to perform. Being the main point of the program, it is recursively called by other parts of the program. By doing so, I managed to decrease code redundancy. I divided the program into different parts. By using different methods for each of the operations, (one method for a operator and its opposite), it was easy to maintain cohesion. Before doing the calculation, I used a method to make it cleaner (i.e.: removing whitespaces, adding operators where not given, remove repeated operators...). I commented when necessary, so I can easily maintain the code.