Created
November 27, 2018 19:02
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Convert numbers to Roman numerals
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| #!/bin/bash | |
| set -eu -o pipefail | |
| number=$1 | |
| # Test that it is valid | |
| [[ "${number//[0-9]/}" == "" ]] || \ | |
| { echo Number ${number} contains invalid characters ; \ | |
| exit 1 ;} | |
| # First we convert the number to a Roman Numeral unary representation | |
| # then we replace appropriate chunks of tokens and end up with a Roman Numeral | |
| # representation. | |
| roman_numerals=$( | |
| printf "%.sI" $(seq 1 ${number}) | | |
| sed 's/IIIII/V/g' | | |
| sed 's/IIII/IV/g' | | |
| sed 's/VV/X/g' | | |
| sed 's/VIV/IX/g' | | |
| sed 's/XXXXX/L/g' | | |
| sed 's/XXXX/XL/g' | | |
| sed 's/LL/C/g' | | |
| sed 's/LXL/XC/g' | | |
| sed 's/CCCCC/D/g' | | |
| sed 's/CCCC/CD/g' | | |
| sed 's/DD/M/g' | | |
| sed 's/DCD/CM/g' | |
| ) | |
| echo ${number} is ${roman_numerals} |
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Thing of beauty