I am trying to divide two Big Integer values and it does not seem to be working. I have tried BigIntegervalue1.div(BigIntegervalue2) and BigIntegervalue1.divideAndRemainder(BigIntegervalue2). I am getting a type mismatch Error when I thought I could declare remainder and quotient with divideAndRemainder which would give me BigInteger

Here is the full code:

package converter
import kotlin.system.exitProcess
import java.math.BigInteger
import java.util.*
var alphabet = listOf("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z")

fun convertNumberToDecimal(numberToConvert: String, sourceBase: Int): String { // fix this formula!
  var finalValue = ""
  var elementHolder = (numberToConvert).toMutableList()
  var i = elementHolder.size - 1
  var j = 0
  var decimalNumber = 0.toString()
  while (i != -1) {
    if (elementHolder.isEmpty()) {
      break
    } else if (elementHolder[j].toString() in alphabet) {
      elementHolder[j] = (9   alphabet.indexOf(elementHolder[j].toString())).toChar()
      decimalNumber  = (elementHolder[j].toInt() * Math.pow(sourceBase.toDouble(), i.toDouble()).toInt()).toString()
      println(decimalNumber)
    } else {
      decimalNumber  = (elementHolder[j].toInt() * Math.pow(sourceBase.toDouble(), i.toDouble()).toInt()).toString()
    }
    j  
    i--
  }
  return decimalNumber
}

fun convertDecimalToNewBase(numberToConvert: String, targetBase: Int): Any {
  var checker = 0
  var i = 0
  var power = targetBase
  var sumOfNumbers = 0
  var decimalNumber: Any
  if (numberToConvert[0] == '0') {
    decimalNumber = BigInteger(numberToConvert.drop(1))
  } else {
    decimalNumber = BigInteger(numberToConvert)
  }
  var listOfNumbers: MutableList<String> = mutableListOf()
  var finalValue = ""
  var denominator = BigInteger("0")
  
  while (checker < numberToConvert.toInt()) {
    checker = Math.pow(targetBase.toDouble(), i.toDouble()).toInt()
    i  
    if (checker > numberToConvert.toInt()) {
      i -= 2
      checker = Math.pow(targetBase.toDouble(), i.toDouble()).toInt()
      break
    }
  }
  
  while (i != -1) {
    denominator = (Math.pow(targetBase.toDouble(), i.toDouble())).toInt().toBigInteger()
    var (quotient, remainder) = decimalNumber.divideAndRemainder(denominator)
    if (quotient.toInt() >= 10 && quotient.toInt() <= 36 && targetBase > 10) {
      quotient = alphabet[(quotient.toInt() - 10)]
    }
    listOfNumbers.add(quotient)
    decimalNumber = remainder
    i--
  }
    
  for (each in listOfNumbers) {
    finalValue  = each.toString()
  }
  for (each in alphabet) {
    if (each in finalValue) {
      return finalValue
    }
  }
  return finalValue.toBigInteger()
}

fun main() {
  var scanner = Scanner(System.`in`)
  println("Enter two numbers in format: {source base} {target base} (To quit type /exit) ")
  var choice = readLine()!!.toString()
  var splitter = listOf<String>()
  var sourceBase: Int
  var targetBase: Int
  var numberInSourceBase: Any
  var newDecimalNumber: Any
  if (choice == "/exit") {
    exitProcess(0)
  } else {
    splitter = choice.split(" ")
    sourceBase = splitter[0].toInt()
    targetBase = splitter[1].toInt()
  }
  do {
    println("Enter number in base "   sourceBase   " to convert to base "   targetBase   " (To go back type /back) ")
    numberInSourceBase = readLine()!!.toString()
    if (numberInSourceBase == "/back") {
      main()
    }
    if (sourceBase != 10) {
      newDecimalNumber = convertNumberToDecimal(numberInSourceBase.toString(), sourceBase)
      newDecimalNumber = (convertDecimalToNewBase(newDecimalNumber.toString(), targetBase)).toString()
    } else {
      newDecimalNumber = (convertDecimalToNewBase(numberInSourceBase.toString(), targetBase)).toString()
    }
    println("Conversion result: "   newDecimalNumber)
  } while (numberInSourceBase != "/back")
}

Here is the line of code that is giving me the type mismatch error:

var (quotient, remainder) = decimalNumber.divideAndRemainder(denominator)

CodePudding user response：

I copied your code and I got a different error. Which is

Unresolved reference: divideAndRemainder

Which is simply because decimalNumber doesn't have that method. Why doesn't it have that method while only BigIntegers are assigned to it? simply because it isn't declared as one.

Changing

var decimalNumber: Any

to

var decimalNumber: BigInteger

removes that error.

Now there are other errors showing, which is up to you how to solve