roman numeral converter

I want to ask if this is correct and will not make any mistake in coverting arabic numbers to roman numerals
Also I want to ask if it is better to use modulus operator.

Code:

---

{
        int year;

        cout<<"Enter a year: ";
        cin>>year;
        cout<<"The Roman Numeral equivalent of "<<year<<" is ";
        while(year>=1000)
        {
                cout<<"M";
                year=year-1000;
        }
        if(year>=900)
        {
                cout<<"CM";
                year=year-900;
        }
        if(year>=500)
        {
                cout<<"D";
                year=year-500;
        }
        if(year>=400)
        {
                cout<<"CD";
                year=year-400;
        }
        while(year>=100)
        {
                cout<<"C";
                year=year-100;
        }
        if(year>=90)
        {
                cout<<"XC";
                year=year-90;
        }
        if(year>=50)
        {
                cout<<"L";
                year=year-50;
        }
        if(year>=40)
        {
                cout<<"XL";
                year=year-40;
        }
        while(year>=10)
        {
                cout<<"X";
                year=year-10;
        }
        if(year>=9)
        {
                cout<<"IX";
                year=year-9;
        }
        if(year>=5)
        {
                cout<<"V";
                year=year-5;
        }
        while(year>=1)
        {
                cout<<"I";
                year=year-1;
        }

}

---

Well how many numbers have you tested?

On the face of it, it seems like a workable answer. But we´re not here to do exhaustive testing for you.

> Also I want to ask if it is better to use modulus operator.
Well it would be a different approach.
But whether that would be better is opinion.

You should try it, just for the experience :)