Thanks for the Reply.
Please clarify one more doubt.
1.) $c=99;
Here $c is var which is holding 99 as value. We can
change $c here ?
2.) $c=\99;
Here also $c is reference which is pointing to 99. So
why we can't change $c=1000?
Thanks in advance
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panku:
You can change $c=1000. What you can't do is change 99 to 1000. When you use $c=1000, it tells perl that $c is no longer pointing to a reference to the constant 99, but is now containing the value 1000. When you use $$c=1000, you're telling perl to change the thing $c points to to 1000. But $c points to the constant value 99. Perl is telling you that it refuses to break the time-space continuum by making 99 be 1000.
...roboticus
When your only tool is a hammer, all problems look like your thumb.
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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.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP Neil Armstrong
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