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