source code

[nafiseh saberi]

hi all.
what are the meaninig in source code of perl:
1-$|=1  (in second line in perl  ???)
2-what is the main meaning of undef ??
3-why in define associative array sometimes use %array(a=>d)
and sometimes use%array('a'=>d)  ??/
thanks.


-------------------------------------------------------------
Best regards.
Nafiseh Saberi  
Iran -  Shiraz
The smooth sea never made a skillful mariner.
----------------------------------------------------------------------