There are two ways of passing data to a subroutine:
- call by value
- call by reference
Actually, there's also:
- call by name
- call by copy-restore
- call by result
- call by push value
- call by need
- call by macro expansion
See Parameter (Computer Science) on Wikipedia.
Most (all?) of these can be done in Perl. In Perl, it really comes down to two things:
1) Parameters are passed as a list of scalars.
2) The caller and the callee have to agree on what those scalars mean.
Quantum Mechanics: The dreams stuff is made of
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
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.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||