Bash solution for week 114, part 2

1 files changed, 39 insertions, 0 deletions

diff --git a/challenge-114/abigail/bash/ch-2.sh b/challenge-114/abigail/bash/ch-2.sh
new file mode 100644
index 0000000000..69980bd2b3
--- /dev/null
+++ b/challenge-114/abigail/bash/ch-2.sh
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+#
+# See ../README.md
+#
+
+#
+# Run as: bash ch-2.sh < input-file
+#
+
+function d2b () {
+    local d=$1
+    b=""
+    while ((d > 0))
+    do b=$((d % 2))$b
+       ((d /= 2))
+    done
+}
+
+function b2d () {
+    local b=$1
+    local p=1
+    d=""
+    while ((${#b} > 0))
+    do  if   [[ ${b:$((${#b} - 1))} == "1" ]]
+        then ((d += p))
+        fi
+        ((p *= 2))
+        b=${b:0:$((${#b} - 1))}
+    done
+}
+
+
+while read number
+do    d2b $number
+      [[ 0$b =~ ^(.*)(01)(1*)(0*)$ ]]
+      b2d ${BASH_REMATCH[1]}10${BASH_REMATCH[4]}${BASH_REMATCH[3]}
+      echo $d
+done