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#
# Perl Weekly Challenge - 031
# Task #1
#
# Mark Senn, http://engineering.purdue.edu/~mark
# October 25, 2019
#
# From
# https://perlweeklychallenge.org/blog/perl-weekly-challenge-031#task-1
# Create a function to check divide by zero error
# without checking if the denominator is zero.
#
# Below are three ways to do this.
#
# Perl 6 is in the process of being renamed Raku.
# Run using Raku v6.d;
use v6.d;
# Return $c or, if $c is undefined return Inf and let
# the caller handle that.
sub div1($a, $b) {
my $c = $a / $b;
return $c // Inf;
}
# Raise a "/0 or other problem" exception. I'm using "or other problem"
# in case something else (maybe a bug) causes $c to be Inf.
# This code is based on code from
# https://docs.perl6.org/type/Failure
sub div2($a, $b) {
my $c = $a / $b;
($c == Inf) and fail '/0 or other problem';
return $c;
}
sub div3($a, $b) {
my $c;
try {
CATCH {
when (X::Numeric::DivideByZero) { return ' /0 or other problem'; }
}
$c = $a / $b;
}
return " $c";
}
sub MAIN() {
my $n = 10;
print 'div1:';
for (0,2) -> $d {
my $c = div1($n, $d);
($c == Inf)
?? ' /0 or other problem'.print
!! " $c".say;
}
print 'div2:';
for (0,2) -> $d {
with div2($n, $d) -> $c {
" $c".say;
} else {
" {.exception.message}".print;
}
}
print 'div3:';
for (0,2) -> $d {
# This won't work without using ".Num".
my $c = div3($n.Num, $d.Num);
$c.print;
}
''.say;
}
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