Sha256: d0e1a4a68d507e35aad3d695d3bb9ee428abe7dd1e32ca8ad31c3564e0100442
Contents?: true
Size: 1.42 KB
Versions: 396
Compression:
Stored size: 1.42 KB
Contents
enum BaseError: Error {
case invalidInputBase
case invalidOutputBase
case negativeDigit
case invalidPositiveDigit
}
struct Base {
static func outputDigits(inputBase: Int, inputDigits: [Int], outputBase: Int) throws -> [Int] {
guard inputBase >= 2 else {
throw BaseError.invalidInputBase
}
guard outputBase >= 2 else {
throw BaseError.invalidOutputBase
}
let sum = try getSum(inputDigits, base: inputBase)
let result = getDigits(sum, base: outputBase)
return result
}
private static func getSum(_ digits: [Int], base: Int) throws -> Int {
var multiplier = 1
var sum = 0
for digit in digits.reversed() {
guard digit >= 0 else {
throw BaseError.negativeDigit
}
guard digit < base else {
throw BaseError.invalidPositiveDigit
}
sum += digit * multiplier
multiplier *= base
}
return sum
}
private static func getDigits(_ sum: Int, base: Int) -> [Int] {
var sum = sum
var digits = [Int]()
var multiplier = 1
while sum > 0 {
multiplier *= base
let value = sum % multiplier
let digit = value / (multiplier / base)
digits.append(digit)
sum -= value
}
return digits.reversed()
}
}
Version data entries
396 entries across 396 versions & 1 rubygems