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#!/usr/bin/env perl
#
# You are given an array of integers, @ints and an integer $start..
#
# Write a script to do the followings:
#
# a) Look for $start in the array @ints, if found multiply the number by 2
# b) If not found stop the process otherwise repeat
#
# In the end return the final value.
# Example 1
#
# Input: @ints = (5,3,6,1,12) and $start = 3
# Output: 24
#
# Step 1: 3 is in the array so 3 x 2 = 6
# Step 2: 6 is in the array so 6 x 2 = 12
# Step 3: 12 is in the array so 12 x 2 = 24
#
# 24 is not found in the array so return 24.
#
# Example 2
#
# Input: @ints = (1,2,4,3) and $start = 1
# Output: 8
#
# Step 1: 1 is in the array so 1 x 2 = 2
# Step 2: 2 is in the array so 2 x 2 = 4
# Step 3: 4 is in the array so 4 x 2 = 8
#
# 8 is not found in the array so return 8.
#
# Example 3
#
# Input: @ints = (5,6,7) and $start = 2
# Output: 2
#
# 2 is not found in the array so return 2.
#
use strict;
use warnings;
use Test2::V0 -no_srand => 1;
use Data::Dumper;
my $cases = [
[[5, 3, 6, 1, 12], 3],
[[1, 2, 4, 3], 1],
[[5, 6, 7], 2],
];
sub multiply_by_two
{
my ($l, $s) = $_[0]->@*;
START:
for my $i (@$l) {
if ($i == $s) {
$s *= 2;
goto START;
}
}
return $s;
}
is(multiply_by_two($cases->[0]), 24, 'Example 1');
is(multiply_by_two($cases->[1]), 8, 'Example 2');
is(multiply_by_two($cases->[2]), 2, 'Example 3');
done_testing();
exit 0;
|
