int_to_roman_to_int_converter

#include <cstdlib>
#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

string intToRoman(int n)
{
  string temp="\0";

  while(n>0){
             if(n>999){
                       n-=1000;
                       temp += "M";
             }else if(n>899){
                       n-=900;
                       temp += "CM";
             }else if(n>499){
                       n-=500;
                       temp += "D";
             }else if(n>399){
                       n-=400;
                       temp += "CD";
             }else if(n>99){
                       n-=100;
                       temp += "C";
             }else if(n>89){
                       n-=90;
                       temp += "XC";
             }else if(n>49){
                       n-=50;
                       temp += "L";
             }else if(n>39){
                       n-=40;
                       temp += "XL";
             }else if(n>9){
                       n-=10;
                       temp += "X";
             }else if(n>8){
                       n-=9;
                       temp += "IX";
             }else if(n>4){
                       n-=5;
                       temp += "V";
             }else if(n>3){
                       n-=4;
                       temp += "IV";
             }else if(n>=1){
                       n--;
                       temp += "I";
             }

  }

  return (temp);
}



int romanToInt(string str)
{
    //Make sure your string is uppercase
    for(unsigned int i=0;i<str.length();i++)
   {
      str[i] = toupper(str[i]);
   }


     int sum=0;

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

               switch(str[i]){
                          case 'M':
                               sum += 1000;
                          break;
                          case 'D':
                               sum += 500;
                          break;
                          case 'C':
                               sum = (str[i+1]=='M' || str[i+1]=='D')? sum-100 : sum+100;
                          break;
                          case 'L':
                               sum += 50;
                          break;
                          case 'X':
                               sum = (str[i+1]=='C' || str[i+1]=='L')? sum-10 : sum+10;
                          break;
                          case 'V':
                               sum = (str[i+1]=='X' || str[i+1]=='L')? sum-5 : sum+5;
                          break;
                          case 'I':
                               sum = (str[i+1]=='X' || str[i+1]=='V')? sum-1 : sum+1;
                          break;

               }
   }
   return sum;
}



int main()
{

   string s = "MmMCVLXii"; //We will uppercase this

   cout << romanToInt(s) << endl;
   cout << intToRoman(romanToInt(s)) << endl;

   system("PAUSE");
    return 0;
}