update

Task/Roman-numerals-Decode/UNIX-Shell/roman-numerals-decode-1.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+roman_to_dec() {
+  local rnum=$1
+  local n=0
+  local prev=0
+
+  for ((i=${#rnum}-1;i>=0;i--))
+  do
+    case "${rnum:$i:1}" in
+    M)  a=1000 ;;
+    D)  a=500 ;;
+    C)  a=100 ;;
+    L)  a=50 ;;
+    X)  a=10 ;;
+    V)  a=5 ;;
+    I)  a=1 ;;
+    esac
+
+    if [[ $a -lt $prev ]]
+    then
+       let n-=a
+    else
+       let n+=a
+    fi
+
+    prev=$a
+  done
+
+  echo "$rnum = $n"
+}
+
+roman_to_dec MCMXC
+roman_to_dec MMVIII
+roman_to_dec MDCLXVI

Task/Roman-numerals-Decode/UNIX-Shell/roman-numerals-decode-2.sh

@@ -0,0 +1,20 @@
+#!/bin/zsh
+function parseroman () {
+  local max=0 sum i j
+  local -A conv
+  conv=(I 1 V 5 X 10 L 50 C 100 D 500 M 1000)
+  for j in ${(Oas::)1}; do
+    i=conv[$j]
+    if (( i >= max )); then
+      (( sum+=i ))
+      (( max=i ))
+    else
+      (( sum-=i ))
+    fi
+  done
+  echo $sum
+}
+
+parseroman MCMXC
+parseroman MMVIII
+parseroman MDCLXVI