罗马数字转换为十进制数

//例子：罗马数字和十进制对照表（部分）

I - 1

//II - 2

//III - 3

//IV - 4

//V – 5

//VI - 6

//VII – 7

//VIII - 8

//IX - 9

//X – 10

//XI – 11

//XII – 12

//XIII – 13

//XIV – 14

//XV – 15

//XVI – 16

//XVII – 17

//XVIII – 18

//XIX – 19

//XX – 20

//XXI – 21

//XXII – 22

//XXVIII - 28

//XXIX - 29

//XXX - 30

//XL - 40

//L - 50

//LX - 60

//LXX - 70

//LXXX - 80

//XC - 90

//XCIX - 99

//C - 100 centum

//CI - 101 centum et unus

//CXCIX - 199

//CC - 200

//CCC - 300

//CD - 400

//D - 500

//DCLXVI - 666

//M - 1,000

//MCMXCIX - 1,999

//MM - 2,000

//MMM - 3,000

//MMMM - 4,000

//MMMMCMXCIX - 4,999

　

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