Course of Raku / Advanced / Control flow / given and when / Exercises / Even, odd, or zero

Solution: Even, odd, or zero

Here is a possible solution to the task.

Code

my $n = 12;

given $n {
    when 0      { say 'zero' }
    when $_ %% 2 { say 'even' }
    default     { say 'odd' }
}

🦋 You can find the source code in the file sign-of-a-number.raku.

Output

even

Comments

when 0 matches the single value zero. It comes first because zero is also even, and we want to report it on its own.
when $_ %% 2 is a condition, where $_ is the topic set by given: the %% operator tests whether it divides evenly by two. The value 12 is not zero but is divisible by two, so the program prints even.
default covers everything left over — the numbers that are neither zero nor even, that is, the odd ones.

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