Suppose I have perl script which has no 'use strict'/'use warnings' in it. In that case what is the significance of a 'my' and 'local' variable in it.
You seem to be under the impression that "strict" and "my" are related. They are not, although if you read Perlmonks you may get the impression they are.
my creates a lexical variable. It's the only way to create a lexical variable, and the variable is always lexical. Whether or not strict or warnings are enabled.
local creates a temporary new value for a package variable (technically, the implementation is slightly different, but for most practical purposes, you won't notice) -- the old value is restored when leaving the current, lexical, scope. However, this temporary value is visible from everywhere, even if you call something in a different scope. The old, stashed away, value isn't accessable from Perlland.
And again, whether or not strict or warnings are enabled is utterly irrelevant.
As for your program, add the following, and see the difference:
print $::a, "\n"; # prints the empty string
print $::b, "\n"; # prints 4
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||