4 files changed, 32 insertions, 35 deletions
diff --git a/challenge-149/abigail/awk/ch-1.awk b/challenge-149/abigail/awk/ch-1.awk
index db6182ff4f..1faa7da576 100644
--- a/challenge-149/abigail/awk/ch-1.awk
+++ b/challenge-149/abigail/awk/ch-1.awk
@@ -18,20 +18,20 @@ function digit_sum (number, sum) {
 }
 
 function is_fib (n, t) {
-    while (g < n) {
-        t = g
-        g = f + g
-        f = t
-        fib [g] = 1
+    while (fib_last < n) {
+        t        = fib_last
+        fib_last = fib_prev + fib_last
+        fib_prev = t
+        fib [fib_last] = 1
     }
     return n in fib
 }
 
 BEGIN {
-    f       = 0
-    g       = 1
-    fib [f] = 1
-    fib [g] = 1
+    fib_prev       = 0
+    fib_last       = 1
+    fib [fib_prev] = 1
+    fib [fib_last] = 1
 }
 
 {
diff --git a/challenge-149/abigail/bash/ch-1.sh b/challenge-149/abigail/bash/ch-1.sh
index bd882f735b..9e87e4f844 100644
--- a/challenge-149/abigail/bash/ch-1.sh
+++ b/challenge-149/abigail/bash/ch-1.sh
@@ -17,19 +17,19 @@ function digit_sum () {
     done
 }
 
-f=0
-g=1
+fib_prev=0
+fib_last=1
 declare -A fib
-fib[$f]=1
-fib[$g]=1
+fib[$fib_prev]=1
+fib[$fib_last]=1
 
 function is_fib () {
     local n=$1
-    while (($g < $n))
-    do   ((t = g))
-         ((g = f + g))
-         ((f = t))
-         fib[$g]=1
+    while (($fib_last < $n))
+    do   ((t        = fib_last))
+         ((fib_last = fib_prev + fib_last))
+         ((fib_prev = t))
+         fib[$fib_last]=1
     done
     is_fib=${fib[$n]:-0}
 }
diff --git a/challenge-149/abigail/bc/ch-1.bc b/challenge-149/abigail/bc/ch-1.bc
index 85f46b7a03..84e3b12665 100644
--- a/challenge-149/abigail/bc/ch-1.bc
+++ b/challenge-149/abigail/bc/ch-1.bc
@@ -18,19 +18,19 @@ define digit_sum (n) {
     return (sum)
 }
 
-f         = 1
-g         = 1
+fib_prev  = 1
+fib_last  = 1
 fib [0]   = 0
 fib [1]   = 1
 fib_count = 2
 
 define is_fib (n) {
     auto t, min, max
-    while (g < n) {
-        t = g
-        g = f + g
-        f = t
-        fib [fib_count] = g
+    while (fib_last < n) {
+        t        = fib_last
+        fib_last = fib_prev + fib_last
+        fib_prev = t
+        fib [fib_count] = fib_last
         fib_count = fib_count + 1
     }
     min = 0
diff --git a/challenge-149/abigail/perl/ch-1.pl b/challenge-149/abigail/perl/ch-1.pl
index 0f4127cb8a..7188924edf 100644
--- a/challenge-149/abigail/perl/ch-1.pl
+++ b/challenge-149/abigail/perl/ch-1.pl
@@ -51,22 +51,19 @@ sub digitsum ($number) {
 # Then it's a simple lookup.
 #
 sub is_fib ($n) {
-    state $fib = {0 => 1, 1 => 1};
-    state $f   = 0;
-    state $g   = 1;
-    while ($g < $n) {
-        ($f, $g)   = ($g, $f + $g);
-        $$fib {$g} = 1;
+    state  $fib = {0 => 1, 1 => 1};
+    state  $fib_prev = 0;
+    state  $fib_last = 1;
+    while ($fib_last < $n) {
+        ($fib_prev, $fib_last) = ($fib_last, $fib_prev + $fib_last);
+        $$fib {$fib_last}      = 1;
     }
     $$fib {$n}
 }
 
 while (<>) {
     for (my ($k, $N) = (0, 0 + $_); $N > 0; $k ++) {
-        if (is_fib (digitsum $k)) {
-            print "$k ";
-            $N --;
-        }
+        $N --, print "$k " if is_fib digitsum $k
     }
     print "\n";
 }