Reddit Daily Programmer #235 - Ruth-Aaron pairs

calculate-ruthaaron.ps1

#Reddit Daily Programmer #235
#https://www.reddit.com/r/dailyprogrammer/comments/3nkanm/20151005_challenge_235_easy_ruthaaron_pairs/

#Function to figure out the factors.
function GetFactors {
	param([int] $number)
	
	$results = @()
	$counter = 2
	
	while($counter -lt $number) {
		if(($number % $counter) -eq 0) {
			$results += $counter
		}
		
		$counter++
	}
	
	return $results
}

#Function to figure out if a factor is prime!
function FindPrimes {
	param([int] $number)
	
	$isPrime = $true
	$counter = 2
	
	while($counter -lt $number) {
		if(($number % $counter) -eq 0) {
			$isPrime = $false
			break
		}
		
		$counter++
	}
	
	return $isPrime
}

#Function to turn array of factors into array of prime factors.
function PrimeArray {
	param($factorArray)
	$results = @()
	
	foreach($factor in $factorArray) {
		if(FindPrimes($factor)) {
			$results += $factor
		}
	}
	
	return $results
}

#Function to sum the array of values.
function SumNums {
	param($primeArray)
	
	$sum = 0
	
	foreach($item in $primeArray) {
		$sum += $item
	}
	
	return $sum
}

#Main code with variables and junk.
$firstNum = 77
$secondNum = 78
$firstFactors = GetFactors($firstNum)
$secondFactors = GetFactors($secondNum)

#Get an array of prime factors for each number.
$firstPrimeFactors = PrimeArray($firstFactors)
$secondPrimeFactors = PrimeArray($secondFactors)

#Now compare the two to find unique values and add them.
$firstSum = SumNums($firstPrimeFactors)
$secondSum = SumNums($secondPrimeFactors)

#See if the sums match!
Write-Host "$firstNum, $secondNum > " -NoNewline
if($firstSum -eq $secondSum) {
	Write-Host "VALID"
} else {
	Write-Host "NOT VALID"
}