I had a task for myself: given interval and a number, find if it is before, in, or after an interval? It can be find using two basic comparisons. But here I tried to use ternary <=>:

use POSIX;
while(<DATA>){
    chomp;
    ($l, $r)=split/ /;
    printf "[%2d %2d] ", $l, $r;
    for $i(-9..10){
        $i or print "|";
        printf "%2d ", floor (($i - $l ) / ($r - $l +1 )) <=> 0
        }
    print "\n"
    }
__DATA__
1 4
2 5
3 7
0 3
-1 5
-8 -2
[download]

OUTPUT:

[ 1  4] -1 -1 -1 -1 -1 -1 -1 -1 -1 |-1  0  0  0  0  1  1  1  1  1  1 
[ 2  5] -1 -1 -1 -1 -1 -1 -1 -1 -1 |-1 -1  0  0  0  0  1  1  1  1  1 
[ 3  7] -1 -1 -1 -1 -1 -1 -1 -1 -1 |-1 -1 -1  0  0  0  0  0  1  1  1 
[ 0  3] -1 -1 -1 -1 -1 -1 -1 -1 -1 | 0  0  0  0  1  1  1  1  1  1  1 
[-1  5] -1 -1 -1 -1 -1 -1 -1 -1  0 | 0  0  0  0  0  0  1  1  1  1  1 
[-8 -2] -1  0  0  0  0  0  0  0  1 | 1  1  1  1  1  1  1  1  1  1  1
[download]

For example I can use the answer as the index of list of 3 elements:
qw(in after before)[find($left, $right, $n)]

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