Auto(de|in)crements
If you want to add 1 to a variable you can, logically, do this; $num=$num+1
. There is a shorter way to do this, which is $num++.
This is an autoincrement. Guess what this is; $num-- .
Yes, an autodecrement.
This example illustrates the above:
$num=10; print "\$num is $num\n"; $num++; print "\$num is $num\n"; $num--; print "\$num is $num\n"; $num+=3; print "\$num is $num\n";
The last example demonstrates that it doesn't have to be just 1 you can add or decrease by.
