1.8 KiB
romannumbers
Instructions
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.
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 number.
Roman Numerals reminder:
| I | 1 | | V | 5 | | X | 10 | | L | 50 | | C | 100 | | D | 500 | | M | 1000 |
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.
The following table gives the Roman numerals for the first few positive integers.
| 1 | I | 11 | XI | 21 | XXI | | 2 | II | 12 | XII | 22 | XXII | | 3 | III | 13 | XIII | 23 | XXIII | | 4 | IV | 14 | XIV | 24 | XXIV | | 5 | V | 15 | XV | 25 | XXV | | 6 | VI | 16 | XVI | 26 | XXVI | | 7 | VII | 17 | XVII | 27 | XXVII | | 8 | VIII | 18 | XVIII | 28 | XXVIII | | 9 | XIX | 19 | XIX | 29 | XXIX | | 10 | X | 20 | XX | 30 | XXX |
Usage
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./rn hello
ERROR: can not convert to roman digit
student@ubuntu:~/[[ROOT]]/test$ ./rn 123
C+X+X+I+I+I
CXXIII
student@ubuntu:~/[[ROOT]]/test$ ./rn 999
(M-C)+(C-X)+(X-I)
CMXCIX
student@ubuntu:~/[[ROOT]]/test$ ./rn 3999
M+M+M+(M-C)+(C-X)+(X-I)
MMMCMXCIX
student@ubuntu:~/[[ROOT]]/test$ ./rn 4000
ERROR: can not convert to roman number
student@ubuntu:~/[[ROOT]]/test$