None --- I don't use iOS. Inferior software support is one of the reasons why.
These are readily available on other platforms. The Android default calculator supports this by simply pulling the display down to reveal "history". And there are a bunch of other apps with even more advanced features and functionality.
Personally, I use an RPN calculator where I have a whole stack to work with --- not just 2 numbers.
These are readily available on other platforms. The Android default calculator supports this by simply pulling the display down to reveal "history". And there are a bunch of other apps with even more advanced features and functionality.
Personally, I use an RPN calculator where I have a whole stack to work with --- not just 2 numbers.