Roman numbers. Write a program that converts a positive integer into the Roman number system. The Roman number system has digits
I ........1
V ........5
X ........10
L ........50
C ........100
D ........500
M ........1,000
Numbers are formed according to the following rules:

a. Only numbers up to 3,999 are represented.

b. As in the decimal system, the thousands, hundreds, tens, and ones are expressed separately.

c. The numbers 1 to 9 are expressed as
I ..........1
II .........2
III ........3
IV ........4
V .........5
VI ........6
VII ...... 7
VIII ..... 8
IX ........9
As you can see, an I preceding a V or X is subtracted from the value, and you can never have more than three I’s in a row.

d. Tens and hundreds are done the same way, except that the letters X, L, C and C,
D, M are used instead of I, V, X, respectively.
Your program should take an input, such as 1978, and convert it to Roman numerals,
MCMLXXVIII.

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