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ch-1.pl
executable file
·60 lines (54 loc) · 1.04 KB
/
ch-1.pl
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#!/usr/bin/env perl
#
# You are given a positive integer, $n.
#
# Write a script to return true if the given integer is a power of three
# otherwise return false.
# Example 1
#
# Input: $n = 27
# Output: true
#
# 27 = 3 ^ 3
#
# Example 2
#
# Input: $n = 0
# Output: true
#
# 0 = 0 ^ 3
#
# Example 3
#
# Input: $n = 6
# Output: false
#
use strict;
use warnings;
use Test2::V0 -no_srand => 1;
use Data::Dumper;
my $cases = [
[27],
[0],
[6],
[1],
[3],
[4]
];
sub three_power
{
my $n = shift;
while ($n) {
last if $n % 3;
$n /= 3;
}
return $n == 1 ? 1 : 0;
}
is(three_power($cases->[0]->@*), 1, 'Example 1 ' . $cases->[0]->[0]);
is(three_power($cases->[1]->@*), 0, 'Example 2 ' . $cases->[1]->[0]);
is(three_power($cases->[2]->@*), 0, 'Example 3 ' . $cases->[2]->[0]);
is(three_power($cases->[3]->@*), 1, 'Example 4 ' . $cases->[3]->[0]);
is(three_power($cases->[4]->@*), 1, 'Example 5 ' . $cases->[4]->[0]);
is(three_power($cases->[5]->@*), 0, 'Example 6 ' . $cases->[5]->[0]);
done_testing();
exit 0;