Challenge 1: Postfix Conditionals — Possible Solution
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use strict;
use warnings;
use feature 'say';

my $temperature = -5;

say "Freezing" if $temperature <= 0;
say "Hot" if $temperature >= 30;

Output (for $temperature = -5):
Freezing

WHY THIS WORKS AS AN ANSWER
------------------------------
Both lines reuse the chapter's own postfix-conditional form exactly —
say "..." if condition; — attaching the condition to the END of the
statement rather than wrapping it in a full if { } block, per the
chapter's own explanation that this reads "almost like natural
English" for a single guarded line.

$temperature <= 0 and $temperature >= 30 reuse the numeric comparison
operators from this chapter's own operator table — <= and >= are the
NUMERIC forms, correctly chosen here since $temperature holds a
number, not le/ge (which would be for string comparison instead).

With $temperature set to -5, only the first postfix condition
($temperature <= 0) evaluates to true, so only "Freezing" prints —
the second line's condition ($temperature >= 30) is false, so that
say statement simply doesn't execute at all, exactly how a postfix
if works: the statement in front of it only runs when the trailing
condition is true.