Decimal To Roman Numeral in C++

 A simple program that will ask the user to give a number in decimal and convert it into Roman Numeral Equivalent using C++ programming language.

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Program Listing

// roman.cpp

// Prof. Jake R. Pomperada, MAED-IT,MIT

// www.jakerpomperada.com / www.jakerpomperada.blogspot.com

// jakerpomperada@gmail.com

// Bacolod City, Negros Occidental Philippines

#include <iostream>

#include <string>

using namespace std;

string decimal_to_roman(int x) {

    int dec[13] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};

    string num[13] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};

    string numeral;

    for(int i = 0; i < 13; i++) {

        while (x >= dec[i]) {

            x -= dec[i];

            numeral.append(num[i]);

        }

    }

    return numeral;

}

int main() {

    int decimal=0;

    

    cout <<"\n\n";

    cout <<"\tDecimal To Roman Numeral in C++";

    cout <<"\n\n";

    cout << "\tGive a Number : ";

    cin >> decimal;

    cout << "\n";

    cout << "\tThe given number is " << decimal;

    cout << "\n";

cout << "\tThe Roman Numeral Value is "<< decimal_to_roman(decimal);

cout << "\n\n";

    cout <<"\tEnd of Program";

    }