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I working on a Hyperskill project in Kotlin to make a number converter which also converts fractions. Now I stuck with fraction converting.

else if (userInput.contains(".")) {
    var firstPart = userInput.substringBefore(".").toBigInteger()
    var secondPart = userInput.substringAfter(".").toString()

How can I convert the secondPart to its proper form? For example userInput is 15.375 and secondPart should be 0.375 Thanks in advance!

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  • To convert the second part of the input to its proper form, you can use the BigDecimal class. The BigDecimal class allows you to work with numbers with arbitrary precision, exapmle: val secondPartString = userInput.substringAfter(".").toString() , val secondPart = BigDecimal(secondPartString).multiply(BigDecimal.ONE), This will give you a BigDecimal representation of 0.375. Commented Jan 15, 2023 at 11:34
  • As well as BigDecimal("12.34"), there's String.toDouble() Commented Jan 15, 2023 at 11:59
  • "As well as BigDecimal("12.34"), there's String.toDouble()" Not really understand your answer. I know I can convert the String to Double, but for converting a fractional number to other base I need to split it to two part, then convert them separately and at the end rejoin them. I think so. Commented Jan 15, 2023 at 12:43
  • @TiborTóth It might help to know exactly what you plan to do with the two parts of the numbers; how will be you converting them to another base? Commented Jan 15, 2023 at 12:58
  • Numbers can be converted to different bases using toString(radix: Int). But I agree with @gidds, more information would help. I think this is an X-Y problem. Commented Jan 15, 2023 at 13:02
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