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55 lines
1.9 KiB
55 lines
1.9 KiB
5 years ago
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## romannumbers
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### Instructions
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Write a program called `rn`. The objective is to convert a number, given as an argument, into a roman number and print it with its roman number calculation.
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The program should have a limit of `4000`. In case of an invalid number, for example `"hello"` or `0` the program should print `ERROR: can not convert to roman digit`.
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Roman Numerals reminder:
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| I | 1 |
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| :-: | :--: |
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| V | 5 |
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| X | 10 |
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| L | 50 |
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| C | 100 |
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| D | 500 |
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| M | 1000 |
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For example, the number 1732 would be denoted MDCCXXXII in Roman numerals. However, Roman numerals are not a purely additive number system. In particular, instead of using four symbols to represent a 4, 40, 9, 90, etc. (i.e., IIII, XXXX, VIIII, LXXXX, etc.), such numbers are instead denoted by preceding the symbol for 5, 50, 10, 100, etc., with a symbol indicating subtraction. For example, 4 is denoted IV, 9 as IX, 40 as XL, etc.
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The following table gives the Roman numerals for the first few positive integers.
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| 1 | I | 11 | XI | 21 | XXI |
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| :-: | :--: | :-: | :---: | :-: | :----: |
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| 2 | II | 12 | XII | 22 | XXII |
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| 3 | III | 13 | XIII | 23 | XXIII |
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| 4 | IV | 14 | XIV | 24 | XXIV |
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| 5 | V | 15 | XV | 25 | XXV |
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| 6 | VI | 16 | XVI | 26 | XXVI |
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| 7 | VII | 17 | XVII | 27 | XXVII |
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| 8 | VIII | 18 | XVIII | 28 | XXVIII |
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| 9 | XIX | 19 | XIX | 29 | XXIX |
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| 10 | X | 20 | XX | 30 | XXX |
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## Usage
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./rn hello
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ERROR: can not convert to roman digit
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student@ubuntu:~/[[ROOT]]/test$ ./rn 123
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C+X+X+I+I+I
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CXXIII
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student@ubuntu:~/[[ROOT]]/test$ ./rn 999
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(M-C)+(C-X)+(X-I)
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CMXCIX
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student@ubuntu:~/[[ROOT]]/test$ ./rn 3999
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M+M+M+(M-C)+(C-X)+(X-I)
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MMMCMXCIX
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student@ubuntu:~/[[ROOT]]/test$ ./rn 4000
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ERROR: can not convert to roman digit
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student@ubuntu:~/[[ROOT]]/test$
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```
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