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Roman to decimal conversion

Roman numerals are symbolic characters such as (I, V, X, L, C, D, and M). The combination of which represents a decimal number. Our goal is to convert roman to valid decimal number. For example.

Input  : "XXII"
Output :  22

Input  : "CLXXXIX"
Output :  189

Input  : "DMLXXXII"
Output :  582

Here given code implementation process.

/*
 Java program
 Roman to decimal conversion
*/
class RomanToDecimal
{
    public int getData(char ch)
    {
        switch (ch)
        {
            case 'I':
                return 1;
            case 'V':
                return 5;
            case 'X':
                return 10;
            case 'L':
                return 50;
            case 'C':
                return 100;
            case 'D':
                return 500;
            case 'M':
                return 1000;
        }
        return -1;
    }
    public void decimalNumber(String romanText)
    {
        int size = romanText.length();
        if (size <= 0)
        {
            return;
        }
        long number = 0;
        int submit1 = 0, submit2 = 0;
        for (int i = 0; i < size; ++i)
        {
            submit1 = getData(romanText.charAt(i));
            if (submit1 == -1)
            {
                return;
            }
            if (i + 1 < size)
            {
                //Get next element of location i+1
                submit2 = getData(romanText.charAt(i + 1));
                if (submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if (submit2 > submit1)
                {
                    number = number - submit1;
                }
                if (submit2 <= submit1)
                {
                    number = number + submit1;
                }
            }
            else
            {
                number += submit1;
            }
        }
        System.out.print(" Roman Text " + romanText + 
                         " : Decimal Number " + number + "\n");
    }
    public static void main(String[] args)
    {
        RomanToDecimal task = new RomanToDecimal();
        // Test Example
        task.decimalNumber("XXII");
        task.decimalNumber("CLXXXIX");
        task.decimalNumber("DMLXXXII");
    }
}

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
// Include namespace system
using System;
/*
 Csharp program
 Roman to decimal conversion
*/
public class RomanToDecimal
{
    public int getData(char ch)
    {
        switch (ch)
        {
            case 'I':
                return 1;
            case 'V':
                return 5;
            case 'X':
                return 10;
            case 'L':
                return 50;
            case 'C':
                return 100;
            case 'D':
                return 500;
            case 'M':
                return 1000;
        }
        return -1;
    }
    public void decimalNumber(String romanText)
    {
        int size = romanText.Length;
        if (size <= 0)
        {
            return;
        }
        long number = 0;
        int submit1 = 0;
        int submit2 = 0;
        for (int i = 0; i < size; ++i)
        {
            submit1 = this.getData(romanText[i]);
            if (submit1 == -1)
            {
                return;
            }
            if (i + 1 < size)
            {
                //Get next element of location i+1
                submit2 = this.getData(romanText[i + 1]);
                if (submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if (submit2 > submit1)
                {
                    number = number - submit1;
                }
                if (submit2 <= submit1)
                {
                    number = number + submit1;
                }
            }
            else
            {
                number += submit1;
            }
        }
        Console.Write(" Roman Text " + romanText + " : Decimal Number " + number + "\n");
    }
    public static void Main(String[] args)
    {
        RomanToDecimal task = new RomanToDecimal();
        // Test Example
        task.decimalNumber("XXII");
        task.decimalNumber("CLXXXIX");
        task.decimalNumber("DMLXXXII");
    }
}

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
// Include header file
#include <iostream>
#include <string>
using namespace std;
/*
 C++ program
 Roman to decimal conversion
*/
class RomanToDecimal
{
    public: int getData(char ch)
    {
        switch (ch)
        {
            case 'I':
                return 1;
            case 'V':
                return 5;
            case 'X':
                return 10;
            case 'L':
                return 50;
            case 'C':
                return 100;
            case 'D':
                return 500;
            case 'M':
                return 1000;
        }
        return -1;
    }
    void decimalNumber(string romanText)
    {
        int size = romanText.length();
        if (size <= 0)
        {
            return;
        }
        long number = 0;
        int submit1 = 0;
        int submit2 = 0;
        for (int i = 0; i < size; ++i)
        {
            submit1 = this->getData(romanText[i]);
            if (submit1 == -1)
            {
                return;
            }
            if (i + 1 < size)
            {
                //Get next element of location i+1
                submit2 = this->getData(romanText[i + 1]);
                if (submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if (submit2 > submit1)
                {
                    number = number - submit1;
                }
                if (submit2 <= submit1)
                {
                    number = number + submit1;
                }
            }
            else
            {
                number += submit1;
            }
        }
        cout << " Roman Text " << romanText 
             << " : Decimal Number " << number << "\n";
    }
};
int main()
{
    RomanToDecimal *task = new RomanToDecimal();
    // Test Example
    task->decimalNumber("XXII");
    task->decimalNumber("CLXXXIX");
    task->decimalNumber("DMLXXXII");
    return 0;
}

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
//C Program
//Roman to decimal conversion
#include <stdio.h>

int get_data(char ch)
{
    switch (ch)
    {
        case 'I':
            return 1;
        case 'V':
            return 5;
        case 'X':
            return 10;
        case 'L':
            return 50;
        case 'C':
            return 100;
        case 'D':
            return 500;
        case 'M':
            return 1000;
    }
    return -1;
}
void roman_number(char roman_text[], int size)
{
    if (size <= 0)
    {
        return;
    }
    long long number = 0;
    int submit1 = 0, submit2 = 0;
    for (int i = 0; i < size; ++i)
    {
        submit1 = get_data(roman_text[i]);
        if (submit1 == -1)
        {
            return;
        }
        if (i + 1 < size)
        {
            //Get next element of location i+1
            submit2 = get_data(roman_text[i + 1]);
            if (submit2 == -1)
            {
                return;
            }
            // Compare current and next element result
            // Current node i and next node is i+1
            if (submit2 > submit1)
            {
                number = number - submit1;
            }
            if (submit2 <= submit1)
            {
                number = number + submit1;
            }
        }
        else
        {
            number += submit1;
        }
    }
    printf(" Roman Text %s : Decimal Number %lld\n", roman_text, number);
}
int main()
{
    char text1[] = "XXII";
    int size = sizeof(text1) / sizeof(text1[0]) - 1;
    //Test Case
    roman_number(text1, size);
    char text2[] = "CLXXXIX";
    size = sizeof(text2) / sizeof(text2[0]) - 1;
    roman_number(text2, size);
    char text3[] = "DMLXXXII";
    size = sizeof(text3) / sizeof(text3[0]) - 1;
    roman_number(text3, size);
    return 0;
}

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
package main
import "fmt"
/*
 Go program
 Roman to decimal conversion
*/

func getData(ch byte) int64 {
    switch ch {
        case 'I':
            return 1
        case 'V':
            return 5
        case 'X':
            return 10
        case 'L':
            return 50
        case 'C':
            return 100
        case 'D':
            return 500
        case 'M':
            return 1000
    }
    return -1
}
func decimalNumber(romanText string) {
    var size int = len(romanText)
    if size <= 0 {
        return
    }
    var number int64 = 0
    var submit1 int64 = 0
    var submit2 int64 = 0
    for i := 0 ; i < size ; i++ {
        submit1 = getData(romanText[i])
        if submit1 == -1 {
            return
        }
        if i + 1 < size {
            //Get next element of location i+1
            submit2 = getData(romanText[i + 1])
            if submit2 == -1 {
                return
            }
            // Compare current and next element result
            // Current node i and next node is i+1
            if submit2 > submit1 {
                number = number - submit1
            }
            if submit2 <= submit1 {
                number = number + submit1
            }
        } else {
            number += submit1
        }
    }
    fmt.Print(" Roman Text ", romanText, " : Decimal Number ", number, "\n")
}
func main() {

    // Test Example
    decimalNumber("XXII")
    decimalNumber("CLXXXIX")
    decimalNumber("DMLXXXII")
}

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582

<?php
/*
 Php program
 Roman to decimal conversion
*/
class RomanToDecimal
{
    public  function getData($ch)
    {
        switch ($ch)
        {
            case 'I':
                return 1;
            case 'V':
                return 5;
            case 'X':
                return 10;
            case 'L':
                return 50;
            case 'C':
                return 100;
            case 'D':
                return 500;
            case 'M':
                return 1000;
        }
        return -1;
    }
    public  function decimalNumber($romanText)
    {
        $size = strlen($romanText);
        if ($size <= 0)
        {
            return;
        }
        $number = 0;
        $submit1 = 0;
        $submit2 = 0;
        for ($i = 0; $i < $size; ++$i)
        {
            $submit1 = $this->getData($romanText[$i]);
            if ($submit1 == -1)
            {
                return;
            }
            if ($i + 1 < $size)
            {
                //Get next element of location i+1
                $submit2 = $this->getData($romanText[$i + 1]);
                if ($submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if ($submit2 > $submit1)
                {
                    $number = $number - $submit1;
                }
                if ($submit2 <= $submit1)
                {
                    $number = $number + $submit1;
                }
            }
            else
            {
                $number += $submit1;
            }
        }
        echo(" Roman Text ".$romanText.
            " : Decimal Number ".strval($number).
            "\n");
    }
}

function main()
{
    $task = new RomanToDecimal();
    // Test Example
    $task->decimalNumber("XXII");
    $task->decimalNumber("CLXXXIX");
    $task->decimalNumber("DMLXXXII");
}
main();

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
/*
 Node JS program
 Roman to decimal conversion
*/
class RomanToDecimal
{
    getData(ch)
    {
        switch (ch)
        {
            case 'I':
                return 1;
            case 'V':
                return 5;
            case 'X':
                return 10;
            case 'L':
                return 50;
            case 'C':
                return 100;
            case 'D':
                return 500;
            case 'M':
                return 1000;
        }
        return -1;
    }
    decimalNumber(romanText)
    {
        var size = romanText.length;
        if (size <= 0)
        {
            return;
        }
        var number = 0;
        var submit1 = 0;
        var submit2 = 0;
        for (var i = 0; i < size; ++i)
        {
            submit1 = this.getData(romanText.charAt(i));
            if (submit1 == -1)
            {
                return;
            }
            if (i + 1 < size)
            {
                //Get next element of location i+1
                submit2 = this.getData(romanText.charAt(i + 1));
                if (submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if (submit2 > submit1)
                {
                    number = number - submit1;
                }
                if (submit2 <= submit1)
                {
                    number = number + submit1;
                }
            }
            else
            {
                number += submit1;
            }
        }
        console.log(" Roman Text " + 
                             romanText + " : Decimal Number " + 
                             number );
    }
}

function main()
{
    var task = new RomanToDecimal();
    // Test Example
    task.decimalNumber("XXII");
    task.decimalNumber("CLXXXIX");
    task.decimalNumber("DMLXXXII");
}
main();

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
# Python 3 program
# Roman to decimal conversion
class RomanToDecimal :
    def getData(self, ch) :
        if (ch == 'I') :
            return 1
        
        elif(ch == 'V') :
            return 5
        
        elif(ch == 'X') :
            return 10
        
        elif(ch == 'L') :
            return 50
        
        elif(ch == 'C') :
            return 100
        
        elif(ch == 'D') :
            return 500
        
        elif(ch == 'M') :
            return 1000
        
        return -1
    
    def decimalNumber(self, romanText) :
        size = len(romanText)
        if (size <= 0) :
            return
        
        number = 0
        submit1 = 0
        submit2 = 0
        i = 0
        while (i < size) :
            submit1 = self.getData(romanText[i])
            if (submit1 == -1) :
                return
            
            if (i + 1 < size) :
                # Get next element of location i+1
                submit2 = self.getData(romanText[i + 1])
                if (submit2 == -1) :
                    return
                
                #  Compare current and next element result
                #  Current node i and next node is i+1
                if (submit2 > submit1) :
                    number = number - submit1
                
                if (submit2 <= submit1) :
                    number = number + submit1
                
            else :
                number += submit1
            
            i += 1
        
        print(" Roman Text", romanText ,
              ": Decimal Number ", number )
    

def main() :
    task = RomanToDecimal()
    #  Test Example
    task.decimalNumber("XXII")
    task.decimalNumber("CLXXXIX")
    task.decimalNumber("DMLXXXII")

if __name__ == "__main__": main()

Output

 Roman Text XXII : Decimal Number  22
 Roman Text CLXXXIX : Decimal Number  189
 Roman Text DMLXXXII : Decimal Number  582
# Ruby program
# Roman to decimal conversion
class RomanToDecimal 
    def getData(ch) 
        if (ch == 'I')
        
            return 1
        elsif(ch == 'V')
        
            return 5
        elsif(ch == 'X')
        
            return 10
        elsif(ch == 'L')
        
            return 50
        elsif(ch == 'C')
        
            return 100
        elsif(ch == 'D')
        
            return 500
        elsif(ch == 'M')
        
            return 1000
        end

        return -1
    end

    def decimalNumber(romanText) 
        size = romanText.length
        if (size <= 0) 
            return
        end

        number = 0
        submit1 = 0
        submit2 = 0
        i = 0
        while (i < size) 
            submit1 = self.getData(romanText[i])
            if (submit1 == -1) 
                return
            end

            if (i + 1 < size) 
                # Get next element of location i+1
                submit2 = self.getData(romanText[i + 1])
                if (submit2 == -1) 
                    return
                end

                #  Compare current and next element result
                #  Current node i and next node is i+1
                if (submit2 > submit1) 
                    number = number - submit1
                end

                if (submit2 <= submit1) 
                    number = number + submit1
                end

            else
 
                number += submit1
            end

            i += 1
        end

        print(" Roman Text ", romanText ," : Decimal Number ", number ,"\n")
    end

end

def main() 
    task = RomanToDecimal.new()
    #  Test Example
    task.decimalNumber("XXII")
    task.decimalNumber("CLXXXIX")
    task.decimalNumber("DMLXXXII")
end

main()

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582

/*
 Scala program
 Roman to decimal conversion
*/
class RomanToDecimal()
{
    def getData(ch: Char): Int = {
              if (ch == 'I')
        {
            return 1;
        }
        else if (ch == 'V')
        {
            return 5;
        }
        else if (ch == 'X')
        {
            return 10;
        }
        else if (ch == 'L')
        {
            return 50;
        }
        else if (ch == 'C')
        {
            return 100;
        }
        else if (ch == 'D')
        {
            return 500;
        }
        else if (ch == 'M')
        {
            return 1000;
        }
        return -1;
    }
    def decimalNumber(romanText: String): Unit = {
        var size: Int = romanText.length();
        if (size <= 0)
        {
            return;
        }
        var number: Long = 0;
        var submit1: Int = 0;
        var submit2: Int = 0;
        var i: Int = 0;
        while (i < size)
        {
            submit1 = getData(romanText.charAt(i));
            if (submit1 == -1)
            {
                return;
            }
            if (i + 1 < size)
            {
                //Get next element of location i+1
                submit2 = getData(romanText.charAt(i + 1));
                if (submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if (submit2 > submit1)
                {
                    number = number - submit1;
                }
                if (submit2 <= submit1)
                {
                    number = number + submit1;
                }
            }
            else
            {
                number += submit1;
            }
            i += 1;
        }
        print(" Roman Text " + romanText + " : Decimal Number " + number + "\n");
    }
}
object Main
{
    def main(args: Array[String]): Unit = {
        var task: RomanToDecimal = new RomanToDecimal();
        // Test Example
        task.decimalNumber("XXII");
        task.decimalNumber("CLXXXIX");
        task.decimalNumber("DMLXXXII");
    }
}

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
import Foundation;
/*
 Swift 4 program
 Roman to decimal conversion
*/
class RomanToDecimal
{
    func getData(_ ch: Character) -> Int
    {
      if (ch == "I")
        {
            return 1;
        }
        else if (ch == "V")
        {
            return 5;
        }
        else if (ch == "X")
        {
            return 10;
        }
        else if (ch == "L")
        {
            return 50;
        }
        else if (ch == "C")
        {
            return 100;
        }
        else if (ch == "D")
        {
            return 500;
        }
        else if (ch == "M")
        {
            return 1000;
        }
        return -1;
    }
    func decimalNumber(_ textNumber: String)
    {
        let romanText = Array(textNumber);
        let size: Int = romanText.count;
      
        if (size <= 0)
        {
            return;
        }
        var number: Int = 0;
        var submit1: Int = 0;
        var submit2: Int = 0;
        var i: Int = 0;
        while (i < size)
        {
            submit1 = self.getData(romanText[i]);
            if (submit1 == -1)
            {
                return;
            }
            if (i + 1 < size)
            {
                //Get next element of location i+1
                submit2 = self.getData(romanText[i + 1]);
                if (submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if (submit2 > submit1)
                {
                    number = number - submit1;
                }
                if (submit2 <= submit1)
                {
                    number = number + submit1;
                }
            }
            else
            {
                number += submit1;
            }
            i += 1;
        }
        print(" Roman Text ", textNumber ," : Decimal Number ", number );
    }
}
func main()
{
    let task: RomanToDecimal = RomanToDecimal();
    // Test Example
    task.decimalNumber("XXII");
    task.decimalNumber("CLXXXIX");
    task.decimalNumber("DMLXXXII");
}
main();

Output

 Roman Text  XXII  : Decimal Number  22
 Roman Text  CLXXXIX  : Decimal Number  189
 Roman Text  DMLXXXII  : Decimal Number  582
/*
 Kotlin program
 Roman to decimal conversion
*/
class RomanToDecimal
{
    fun getData(ch: Char): Int
    {
      if (ch == 'I')
        {
            return 1;
        }
        else if (ch == 'V')
        {
            return 5;
        }
        else if (ch == 'X')
        {
            return 10;
        }
        else if (ch == 'L')
        {
            return 50;
        }
        else if (ch == 'C')
        {
            return 100;
        }
        else if (ch == 'D')
        {
            return 500;
        }
        else if (ch == 'M')
        {
            return 1000;
        }
        return -1;
    }
    fun decimalNumber(romanText: String): Unit
    {
        val size: Int = romanText.length;
        if (size <= 0)
        {
            return;
        }
        var number: Long = 0;
        var submit1: Int;
        var submit2: Int;
        var i: Int = 0;
        while (i < size)
        {
            submit1 = this.getData(romanText.get(i));
            if (submit1 == -1)
            {
                return;
            }
            if (i + 1 < size)
            {
                //Get next element of location i+1
                submit2 = this.getData(romanText.get(i + 1));
                if (submit2 == -1)
                {
                    return;
                }
                // Compare current and next element result
                // Current node i and next node is i+1
                if (submit2 > submit1)
                {
                    number = number - submit1;
                }
                if (submit2 <= submit1)
                {
                    number = number + submit1;
                }
            }
            else
            {
                number += submit1;
            }
            i += 1;
        }
        print(" Roman Text " + romanText + 
              " : Decimal Number " + number + "\n");
    }
}
fun main(args: Array < String > ): Unit
{
    val task: RomanToDecimal = RomanToDecimal();
    // Test Example
    task.decimalNumber("XXII");
    task.decimalNumber("CLXXXIX");
    task.decimalNumber("DMLXXXII");
}

Output

 Roman Text XXII : Decimal Number 22
 Roman Text CLXXXIX : Decimal Number 189
 Roman Text DMLXXXII : Decimal Number 582
Last updated on by Kalkicode




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