Course of Raku / Addendum 🆕 / Flow and functions / Control flow and logic / Exercises / Sign and parity

Solution: Sign and parity

Here is a possible solution to the task.

Code

for -4, 0, 7 -> $n {
    my $sign   = $n < 0 ?? 'negative' !! $n == 0 ?? 'zero' !! 'positive';
    my $parity = $n %% 2 ?? 'even' !! 'odd';

    say "$n is $sign and $parity";
}

🦋 You can find the source code in the file classify-number.raku.

Output

-4 is negative and even
0 is zero and even
7 is positive and odd

Comments

The sign is chosen with a chained ternary: negative when below zero, otherwise zero when equal, otherwise positive.
$n %% 2 tests divisibility by two, so it is true for even numbers and false for odd ones. (0 counts as even.)

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