convert roman number to integer in java

Categories: Java Java Programming & Coding

package r4r.in;


import java.util.Scanner;


public class ConvertRomanNumbertoIntegerNumber {


public static void main(String[] args) {

//convert roman number to integer in java 

Scanner scanner = new Scanner(System.in);

String inputRomanNumber = scanner.nextLine();

System.out.println("Input String:-" + inputRomanNumber);

int integerNumber = convertRomanNumberToIntegerNumber(inputRomanNumber);

System.out.println("Integer Number:" + integerNumber);


}


// 4=IVVVVVVVVV

private static int convertRomanNumberToIntegerNumber(String inputRomanNumber) {

int sum = 0;

for (int i = 0; i < inputRomanNumber.length(); i++) {

int n1 = romanToNumber(inputRomanNumber.charAt(i));

if (i + 1 < inputRomanNumber.length()) {

int n2 = romanToNumber(inputRomanNumber.charAt(i + 1));

if (n1 >= n2)

sum = sum + n1;

else

sum = sum - n1;

} else

sum = sum + n1;

}


return sum;

}


private static int romanToNumber(char c) {

return switch (c) {

case 'I' -> 1;

case 'V' -> 5;

case 'X' -> 10;

case 'L' -> 50;

case 'C' -> 100;

case 'D' -> 500;

case 'M' -> 1000;

default -> -1;

};

}


}


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