Question

How to convert a Roman number to an integer in Kotlin

Answer 1

object RomanToInteger {

    private val romanMap: Map<Char, Int> = mapOf(
        'I' to 1,
        'V' to 5,
        'X' to 10,
        'L' to 50,
        'C' to 100,
        'D' to 500,
        'M' to 1000
    )

    fun romanToInt(s: String): Int {
        var total = 0
        var prevValue = 0

        for (ch in s.reversed()) {
            val currentValue = romanMap[ch] ?: 0
            if (currentValue < prevValue) {
                total -= currentValue
            } else {
                total += currentValue
            }
            prevValue = currentValue
        }

        return total
    }

    @JvmStatic
    fun main(args: Array<String>) {
        val roman = "XCVII"
        val result = romanToInt(roman)
        
        println("The integer value of $roman is $result")
    }
}


/*
XCVII =
XC+V+I+I =
90+5+1+1 =
97
*/



/*
run:

The integer value of XCVII is 97

*/

 

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