Back, Enter, and Cancel Buttons using Arduino Mega

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hi all,

i trying create simple menu interface project working on.  user go through series of questions enter information.  once have entered numbers keypad press enter button move on next menu screen.  problem facing how implement cancel , buttons in code.  have tried attachinterrupt function not restart void loop, continues interrupted.  have not looked coding button yet i'm assuming similar cancel button code.  avoid writing if statements each line of code inside void loop have hundreds of lines of code inside of it.  thanks!

perhaps if show have far? if nice , modular should able cancel without many problems.


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