The statements
Set V[x] ""
and
Set V[x]
carry out the same function. Personally I prefer
Set V[stName] ""
since it makes it clear that you haven't forgotten to specify a value.
The notation
V[x] 0
is fine if you add some values to this variable later on.
In some situations
it makes sense to distinguish between 0 (which means zero) and "" (which
means "nothing" or "not yet set") and in this case the empty
string "" is a reasonable initial value for variables with a numeric
value.
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