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--- notes:perl_cheat_sheet [2026/09/14 01:01]
49.37.116.225 old revision restored (2026/08/03 07:47)
+++ notes:perl_cheat_sheet [2026/09/14 06:02] (current)
216.73.217.14 old revision restored (2026/09/12 20:46)
@@ Line 18: / Line 18: @@
   * All numbers are stored in the same format e.g.-6.5e24, 037 (octal), 0x2a13b (hex), 0b11010 (binary)
   * Underscores for readability are ignored e.g. 0x1377_0B77
-  * Arithmetic operators are * / + - % (modulus) %%**%% (exponentiation)
+  * Arithmetic operators are * / + - % (modulus) ** (exponentiation)
   * Comparison operators are < <= == >= > !=
@@ Line 73: / Line 73: @@
     $count += 2;
 }</code>
-  * foreach loop <code perl>foreach my $rock (@rocks) {
+  * foreach loop <code perl>foreach $rock (@rocks) {
   # modifications to $rock modify the list element
   # $_ is used if loop variable is omitted
@@ Line 83: / Line 83: @@
   * ''chomp'' removes a newline e.g. ''chomp($line=<STDIN>);''
   * Assigning <STDIN> to a list reads all input up till EOF e.g. <code perl> chmop(@lines = <STDIN>);</code>
-===== User Subroutines =====
-  * Subroutines are in their own namespace and are typically called using ''&mysub'' (sometimes the ampersand can be omitted).
-  * Subroutines can be defined anywhere e.g. <code perl> sub mysub {
-  my($m, $n) = @_
-  $m + $n;
-} </code>
-  * The value of the last expression evaluated is returned. But ''return $a;'' can be used to return immediately.
-  * Arguments are in the list @_ . If ''&mysub;'' is used, the parent's argument list is inherited.
-  * Lexical scoped variables can be used in any block by prefixing with ''my''.
-  * Ampersand is optional if subroutine has previously been declared or if parenthesis are used. Ampersand is not optional if built-in subroutine is being overridden.

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