2012 - Episode II Problem A

#include <fstream>
#include <string>

using namespace std;

int main()
{
    string str;
    int weight(0);

    ifstream ifs("roman.in");
    getline(ifs, str);
    ifs.close();

    for (int i = 0; i < str.length(); i++)
    {
        switch (str[i])
        {
            case 'I': weight += 1;      break;
            case 'V': weight += 5;      break;
            case 'X': weight += 10;     break;
            case 'L': weight += 50;     break;
            case 'C': weight += 100;    break;
            case 'D': weight += 500;    break;
            case 'M': weight += 1000;   break;
        }
    }

    ofstream ofs("roman.out");
    ofs << weight;
    ofs.close();
}