GitHub_collection_leetcode/algorithms/cpp/integerToRoman/integerToRoman.cpp

// Source : https://oj.leetcode.com/problems/integer-to-roman/
// Author : Hao Chen
// Date   : 2014-07-17

/********************************************************************************** 
* 
* Given an integer, convert it to a roman numeral.
* 
* Input is guaranteed to be within the range from 1 to 3999.
*               
**********************************************************************************/

#include <stdlib.h>
#include <string>
#include <iostream>
using namespace std;

//greeding algorithm
string intToRoman(int num) {
    string symbol[] =   {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};    
    int value[]     =   {1000,900,500,400, 100, 90,  50, 40,  10, 9,   5,  4,   1}; 
    string result;

    for(int i=0; num!=0; i++){
        while(num >= value[i]){
            num -= value[i];
            result+=symbol[i];
        }
    }

    return result;
}


int main(int argc, char** argv)
{
    int num = 1234;
    if (argc>0){
        num = atoi(argv[1]);
    }    

    cout << num << " : " << intToRoman(num) << endl;
    return 0;
}