英文作业：输入一个1~3999数字 将这个数字换成罗马数字

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Assignment #7

Goals:

Ø This lab gives students more experience in

· Top-down Design and procedural abstraction.

· Good style programming

Background Information

Roman Numbers.  The Roman Number System has seven digits as follows:

        I        1

        V        5

        X        10        

            L        50

        C        100

        D        500

        M        1000

Numbers are formed according to the following rules:

1. Only numbers up to 3999 are represented.

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

3.   The numbers 1 to 9 are expressed as shown.  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.

I        II        III        IV        V        VI        VII        VIII        IX

4. Tens and hundreds are done the same way, except that letters X, L, C, D, M are used instead of letters I, V, X.  

Requirement:

Write an algorithm and then a structured program that converts a positive integer into Roman Number System. Your program shall take, as input, a number such as 1978, and convert it to its equivalent in the Roman Number System as MCMLXXVIII.

Marking Scheme

[3 marks] Presentation/Style: Organization, readability, descriptive identifier, indentation, bracket

   placement.

[14 marks] Correctness: Program works without bugs. Appropriate us of methods.

[3 marks] Documentation: Internal

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