in reply to Re^2: Modification of a read-only value attempted
in thread Modification of a read-only value attempted
So why we can't change $c=1000?
As roboticus points out, you can make that change. That is, you can overwrite the value in $c -- currently the address of the constant 99 -- with any other value.
What you cannot do is overwrite the value held at the address held in $c, because it is a constant.
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