created Eclipse project for homework
added main application class
created gui
catching button clicks
checking event source
passing data source to event handler
added separate methods for handling calculator commands
added appendData method to IDataSource
handling input of first argument
handling operation input
fixed division button label
fixed firstArg initialization
initializing second arg
better logs
fixed firstArg initialization
evaluating expression
clearing displayField on new expression
handling dot
added author info
removed unused vars