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Please post the current version of the program and explain what it is doing and what you want it to do.

There is no statement in the posted code that stores anything in a after a is assigned null.

Do you know how an assignment statement works? The variable receiving the value is to the left of the...

Can you post the code that shows the error? What you posted doesn't show the error.

Where is the variable a assigned a value after it is assigned the value of null?

Where do you print out the value of a? I don't see any print statement in the posted code.

Where does the code assign any values to a?

Is there some other code you are talking about? The...