Let me also just add that the following command is completely invalid

inc $printnumber 1;
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'inc' is just not perl command...

Perl CAN, of course, increment a number, using $printnumber++ much like in C.

What actually happened is that perl often interprates 'foo bar' as 'bar->foo', a method call. This lets things like the following work naturally

# Java'ish looking way
my $Object = new Some::Class( $arg );

# Simple method call
my $Object = Some::Class->new( $arg );
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