/********************************************************************************************
example 4 -- roman.cpp
    Implementation for class roman.
********************************************************************************************/
#include "roman.h"

ostream& operator<<(ostream& out, const roman& R) {
    out << R.asString();
    return out;
}

// ------- display tool -------
string roman::asString() const {
    int value = number;

    string converted = "";

    if (value < 1) {
        converted = "underflow";
        return converted;
    }
    else if (value > 3888) {
        converted = "overflow";
        return converted;
    }
    else {
        for (int i=0, stop = value/1000; i < stop; i++) {
            value -= 1000;
            converted += 'M';
        }

        switch (value/100) {
            case 0:
                break;
            case 9:
                value -= 900;
                converted += "CM";
                break;
            case 4:
                value -= 400;
                converted += "CD";
                break;
            case 8: case 7: case 6: case 5:
                value -= 500;
                converted += 'D';
                //fall through and do 3, 2 & 1!!!
            default:
                for (int i=0, stop=value/100; i < stop; i++) {
                    value -= 100;
                    converted += 'C';
                }
        }

        switch (value/10) {
            case 0:
                break;
            case 9:
                value -= 90;
                converted += "XC";
                break;
            case 4:
                value -= 40;
                converted += "XL";
                break;
            case 8: case 7: case 6: case 5:
                value -= 50;
                converted += 'L';
                //fall through and do 3, 2 & 1!!!
            default:
                for (int i=0, stop=value/10; i < stop; i++) {
                    value -= 10;
                    converted += 'X';
                }
        }

        switch (value) {
            case 0:
                break;
            case 9:
                converted += "IX";
                break;
            case 4:
                converted += "IV";
                break;
            case 8: case 7: case 6: case 5:
                value -= 5;
                converted += 'V';
                //fall through and do 3, 2 & 1!!!
            default:
                for (int i=0; i < value; i++)
                    converted += 'I';
        }
        return converted;
    }
}