More Input on Keypad

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Is your feature request related to a problem? Please describe. The current keypad can only be a maximum of 4X4 size. I am making a calculator to learn C and Arduino. Currently I can only have 9 digits, the four basic operations, clear, and ANS. As I make it more advanced I would like to allow more actions on the calculator (ie: parenthesis, variables, etc).

Describe the solution you'd like Allowing more input on the keypad or adding a new way to add input such as a keyboard could solve my problems.