Notes for Slide 08
Java will not allow you to attempt to get the value
of an int variable until you put a value into it.
Notice that this is different than a String variable which
has a value of null.
With a String variable,
you are allowed to check if the value is null.
With an int variable, however,
you are not allowed to do anything with it until
you put a number into to. You are not even allowed
to check to see if the variable is empty.
The example program above on the left shows using an
input statement to place a number into the guess variable.
The erroneous program above on the right shows a
second statement that is not acceptable Java because the
guess variable would be empty when the second statement runs.
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