Well, to understand recursion, you first need... to understand recursion. ;-)
More seriously, various useful and valuable suggestions have been made by others above, like using the Devel::Trace module or adding useful print statements to follow what is going on. Another way to try to understand this type of things, that I am using quite frequently when I have trouble to understand how a program works, is to run the program step by step under the Perl debugger. The most useful options to start with may be s, c, n and r to control the flow of your program, p and x to print the value of variables or expressions, and w to add a watch on a variable. Use the h option (help) to better understand what these other options do. Or type perldoc perldebug for more help on the debugger.
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.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||