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Yeah. but, i don't know where to add validation

I have not yet solve the problem. trying to solve now.

● Validation (and feedback)
The program should handle ALL invalid entries by the user, e.g. invalid numeric data, adding when the array is full, etc. If user made a mistake in the entry, the program...

may i know where to add validation?

I can't update my quantity. when i add or subtract, it does not show up.

thanks alot. i have solved it.

thanks alot. i have solved it.