How to display zero in the screen's input field using numc type

Hi,
I want to display the zero value in the input field , when I  using the NUMC input field on the screen .
The zero will be changed to blank ,when I click the Enter key.
What I should do for it?
Any help is appreciated.
Regards,
Trevor

Hi ,
Thanks for your quickly answer!
I use the numc input field in the dialog's screen.
I am not sure how to do the realize the function like 'UNPACK'?
In fact, I can't changed my input field's data type.
When the status of my input field is display, I can display the zero on the screen. But when the input field is input status , there is blank!
Regards
Trevor

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