From a69ebee867247a05f53192ea01af5f08f2259b15 Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Wed, 20 Oct 2021 20:58:09 +0200
Subject: Go solutions for week 135

---
 challenge-135/abigail/README.md  |  2 ++
 challenge-135/abigail/go/ch-1.go | 67 ++++++++++++++++++++++++++++++++++++++++
 challenge-135/abigail/go/ch-2.go | 62 +++++++++++++++++++++++++++++++++++++
 3 files changed, 131 insertions(+)
 create mode 100644 challenge-135/abigail/go/ch-1.go
 create mode 100644 challenge-135/abigail/go/ch-2.go

diff --git a/challenge-135/abigail/README.md b/challenge-135/abigail/README.md
index b0164d2fd2..14b229d5a9 100644
--- a/challenge-135/abigail/README.md
+++ b/challenge-135/abigail/README.md
@@ -5,6 +5,7 @@
 * [AWK](awk/ch-1.awk)
 * [Bash](bash/ch-1.sh)
 * [C](c/ch-1.c)
+* [Go](go/ch-1.go)
 * [Lua](lua/ch-1.lua)
 * [Node.js](node/ch-1.js)
 * [Perl](perl/ch-1.pl)
@@ -17,6 +18,7 @@
 * [AWK](awk/ch-2.awk)
 * [Bash](bash/ch-2.sh)
 * [C](c/ch-2.c)
+* [Go](go/ch-2.go)
 * [Lua](lua/ch-2.lua)
 * [Node.js](node/ch-2.js)
 * [Perl](perl/ch-2.pl)
diff --git a/challenge-135/abigail/go/ch-1.go b/challenge-135/abigail/go/ch-1.go
new file mode 100644
index 0000000000..7a8c7350b5
--- /dev/null
+++ b/challenge-135/abigail/go/ch-1.go
@@ -0,0 +1,67 @@
+package main
+
+//
+// See ../README.md
+//
+
+//
+// Run as: go run ch-1.go
+//
+
+import (
+    "fmt"
+    "bufio"
+    "os"
+    "strings"
+)
+
+func main () {
+    var reader = bufio . NewReader (os. Stdin)
+  main_loop:
+    for {
+        var text, err = reader . ReadString ('\n')
+        if (err != nil) {
+            break
+        }
+        //
+        // Get rid of newline
+        //
+        text = strings . TrimRight (text, "\n")
+
+        //
+        // Remove leading sign, if any
+        //
+        if (text [0:1] == "-" || text [0:1] == "+") {
+            text = text [1:]
+        }
+
+        //
+        // Check if each character is a number
+        //
+        for _, rune := range text {
+            if rune < '0' || rune > '9' {
+                fmt . Print ("not an integer\n")
+                continue main_loop
+            }
+        }
+        
+        //
+        // Check for even length
+        //
+        if len (text) % 2 == 0 {
+            fmt . Print ("even number of digits\n")
+            continue main_loop
+        }
+
+        //
+        // Long enough?
+        //
+        if len (text) < 3 {
+            fmt . Print ("too short\n")
+            continue main_loop
+        }
+
+        fmt . Printf ("%s\n", text [(len (text) - 3) / 2 :
+                                    (len (text) + 3) / 2])
+    }
+}
diff --git a/challenge-135/abigail/go/ch-2.go b/challenge-135/abigail/go/ch-2.go
new file mode 100644
index 0000000000..bb8e636c00
--- /dev/null
+++ b/challenge-135/abigail/go/ch-2.go
@@ -0,0 +1,62 @@
+package main
+
+//
+// See ../README.md
+//
+
+//
+// Run as: go run ch-2.go
+//
+
+import (
+    "fmt"
+    "bufio"
+    "os"
+    "strings"
+    "regexp"
+)
+
+func main () {
+    var reader = bufio . NewReader (os. Stdin)
+    var w      = [] rune {1, 3, 1, 7, 3, 9, 1}
+    for {
+        var text, err = reader . ReadString ('\n')
+        if (err != nil) {
+            break
+        }
+
+        //
+        // Remove trailing newline
+        //
+        text = strings . TrimRight (text, "\n")
+
+        //
+        // Syntax check
+        //
+        match, _ := regexp . MatchString (
+            "^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}[0-9]$", text)
+
+        if !match {
+            fmt . Print ("0\n")
+            continue
+        }
+
+        //
+        // Check sum
+        //
+        var check rune = 0
+        for i, rune := range text {
+            if rune <= '9' {
+                rune -= '0'
+            } else {
+                rune -= 'A'
+            }
+            check += w [i] * rune
+        }
+        if check % 10 == 0 {
+            fmt . Print ("1\n")
+        } else {
+            fmt . Print ("0\n")
+        }
+    }
+}
-- 
cgit 


From a761e5f5c11dee3dc7f95a9bd1b3b47b1b60a23a Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Thu, 21 Oct 2021 15:18:52 +0200
Subject: Java solutions for week 135

---
 challenge-135/abigail/README.md      |  2 ++
 challenge-135/abigail/java/ch-1.java | 44 +++++++++++++++++++++++++++++++++++
 challenge-135/abigail/java/ch-2.java | 45 ++++++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+)
 create mode 100644 challenge-135/abigail/java/ch-1.java
 create mode 100644 challenge-135/abigail/java/ch-2.java

diff --git a/challenge-135/abigail/README.md b/challenge-135/abigail/README.md
index 14b229d5a9..e10d8fbeda 100644
--- a/challenge-135/abigail/README.md
+++ b/challenge-135/abigail/README.md
@@ -6,6 +6,7 @@
 * [Bash](bash/ch-1.sh)
 * [C](c/ch-1.c)
 * [Go](go/ch-1.go)
+* [Java](java/ch-1.java)
 * [Lua](lua/ch-1.lua)
 * [Node.js](node/ch-1.js)
 * [Perl](perl/ch-1.pl)
@@ -19,6 +20,7 @@
 * [Bash](bash/ch-2.sh)
 * [C](c/ch-2.c)
 * [Go](go/ch-2.go)
+* [Java](java/ch-2.java)
 * [Lua](lua/ch-2.lua)
 * [Node.js](node/ch-2.js)
 * [Perl](perl/ch-2.pl)
diff --git a/challenge-135/abigail/java/ch-1.java b/challenge-135/abigail/java/ch-1.java
new file mode 100644
index 0000000000..c22cbf3132
--- /dev/null
+++ b/challenge-135/abigail/java/ch-1.java
@@ -0,0 +1,44 @@
+//
+// See ../README.md
+//
+
+//
+// Run as: ln ch-1.java ch1.java; javac ch1.java; java ch1 < input-file
+//
+
+import java.util.*;
+import java.util.regex.Pattern;
+
+public class ch1 {
+    public static void main (String [] args) {
+        Scanner scanner = new Scanner (System . in);
+        try {
+            while (true) {
+                String line = scanner . nextLine ();
+                if (!Pattern . matches ("^[-+]?[0-9]+$", line)) {
+                    System . out . println ("not an integer");
+                    continue;
+                }
+                if (Pattern . matches ("^[-+].*", line)) {
+                    line = line . substring (1);
+                }
+                int ll = line . length ();
+                if (ll % 2 == 0) {
+                    System . out . println ("even number of digits");
+                    continue;
+                }
+                if (ll < 3) {
+                    System . out . println ("too short");
+                    continue;
+                }
+                System . out . println (line . substring ((ll - 3) / 2,
+                                                          (ll + 3) / 2));
+            }
+        }
+        catch (Exception e) {
+            //
+            // EOF
+            //
+        }
+    }
+}
diff --git a/challenge-135/abigail/java/ch-2.java b/challenge-135/abigail/java/ch-2.java
new file mode 100644
index 0000000000..477e59f8d3
--- /dev/null
+++ b/challenge-135/abigail/java/ch-2.java
@@ -0,0 +1,45 @@
+//
+// See ../README.md
+//
+
+//
+// Run as: ln ch-2.java ch2.java; javac ch2.java; java ch2 < input-file
+//
+
+import java.util.*;
+import java.util.regex.Pattern;
+
+public class ch2 {
+    public static void main (String [] args) {
+        Scanner scanner = new Scanner (System . in);
+        String  valid   = "[0-9BCDFGHJKLMNPQRSTVWXYZ]";
+        String  pattern = "^" + valid + valid + valid +
+                                valid + valid + valid + "[0-9]" + "$";
+        int [] w        = {1, 3, 1, 7, 3, 9, 1};
+        try {
+            while (true) {
+                String sedol = scanner . nextLine ();
+                //
+                // Check for the correct syntax
+                //
+                if (!Pattern . matches (pattern, sedol)) {
+                    System . out . println (0);
+                    continue;
+                }
+                char [] chars = sedol . toCharArray ();
+                int check = 0;
+                for (int i = 0; i < 7; i ++) {
+                    int val = (int) chars [i];
+                    val   -= val <= (int) '9' ? (int) '0' : (int) 'A';
+                    check += w [i] * val;
+                }
+                System . out . println (check % 10 == 0 ? 1 : 0);
+            }
+        }
+        catch (Exception e) {
+            //
+            // EOF
+            //
+        }
+    }
+}
-- 
cgit 


From f99e71c8bc4fa2a05cacbd35b1871cff3f81fe72 Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Fri, 22 Oct 2021 15:49:40 +0200
Subject: Scheme solutions for week 135

---
 challenge-135/abigail/README.md       |  2 ++
 challenge-135/abigail/scheme/ch-1.scm | 41 +++++++++++++++++++++
 challenge-135/abigail/scheme/ch-2.scm | 67 +++++++++++++++++++++++++++++++++++
 3 files changed, 110 insertions(+)
 create mode 100644 challenge-135/abigail/scheme/ch-1.scm
 create mode 100644 challenge-135/abigail/scheme/ch-2.scm

diff --git a/challenge-135/abigail/README.md b/challenge-135/abigail/README.md
index e10d8fbeda..6178e463fe 100644
--- a/challenge-135/abigail/README.md
+++ b/challenge-135/abigail/README.md
@@ -12,6 +12,7 @@
 * [Perl](perl/ch-1.pl)
 * [Python](python/ch-1.py)
 * [Ruby](ruby/ch-1.rb)
+* [Scheme](scheme/ch-1.scm)
 * [Tcl](tcl/ch-1.tcl)
 
 ## Part 2
@@ -26,4 +27,5 @@
 * [Perl](perl/ch-2.pl)
 * [Python](python/ch-2.py)
 * [Ruby](ruby/ch-2.rb)
+* [Scheme](scheme/ch-2.scm)
 * [Tcl](tcl/ch-2.tcl)
diff --git a/challenge-135/abigail/scheme/ch-1.scm b/challenge-135/abigail/scheme/ch-1.scm
new file mode 100644
index 0000000000..1b391cd159
--- /dev/null
+++ b/challenge-135/abigail/scheme/ch-1.scm
@@ -0,0 +1,41 @@
+;;;
+;;; See ../README.md
+;;;
+
+;;;
+;;; Run as: guile --no-auto-compile ch-1.scm < input-file
+;;;
+
+(use-modules (ice-9 regex))
+(use-modules (ice-9 rdelim))
+
+(define (main)
+    (define line (read-line))
+    (define is-number)
+    (define number)
+    (define ll)
+    (if (not (eof-object? line))
+        (begin
+            (set! is-number (string-match "^[-+]?([0-9]+)$" line))
+            (if (not is-number)
+                (display "not an integer")
+                (begin
+                    (set! number (match:substring is-number 1))
+                    (set! ll (string-length number))
+                    (if (= (modulo ll 2) 0)
+                        (display "even number of digits")
+                        (if (< ll 3)
+                            (display "too short")
+                            (display (substring number (/ (- ll 3) 2)
+                                                       (/ (+ ll 3) 2)))
+                        )
+                    )
+                )
+            )
+            (newline)
+            (main)
+        )
+    )
+)
+
+(main)
diff --git a/challenge-135/abigail/scheme/ch-2.scm b/challenge-135/abigail/scheme/ch-2.scm
new file mode 100644
index 0000000000..f5c29b5dac
--- /dev/null
+++ b/challenge-135/abigail/scheme/ch-2.scm
@@ -0,0 +1,67 @@
+;;;
+;;; See ../README.md
+;;;
+
+;;;
+;;; Run as: guile --no-auto-compile ch-2.scm < input-file
+;;;
+
+(use-modules (ice-9 regex))
+(use-modules (ice-9 rdelim))
+(use-modules (ice-9 iconv))
+(use-modules (rnrs bytevectors))
+(use-modules (srfi srfi-1))
+
+(define pat   "^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}[0-9]$")
+(define w     (list 1 3 1 7 3 9 1))
+
+
+;;
+;; Create a procedure 'byte->val'. It takes the ASCII value of a
+;; character, and returns the corresponding number for the SEDOL
+;; checksum (-10 for "A" .. "Z").
+;;
+(define ords  (bytevector->u8-list (string->bytevector "09A" "UTF-8")))
+(define ord-0 (list-ref ords 0))
+(define ord-9 (list-ref ords 1))
+(define ord-A (list-ref ords 2))
+(define (byte->val b)
+    (if (<= b ord-9)
+        (-  b ord-0)
+        (-  b ord-A)))
+
+
+(define (main)
+    (define sedol (read-line))
+    (define is-sedol)
+    (define valid 0)
+    (define check 0)
+    (define values)
+    (if (not (eof-object? sedol))
+        (begin
+            (set! valid 0)
+            (set! check 0)
+            (set! is-sedol (string-match pat sedol))
+            (if (regexp-match? is-sedol)
+                (begin
+                    (set! values
+                        (map-in-order byte->val
+                            (bytevector->u8-list 
+                                (string->bytevector
+                                    (match:substring is-sedol 0) "UTF-8"))))
+                    (set! check
+                        (fold (lambda (weight val sum) (+ sum (* weight val)))
+                              0 w values))
+                    ;;
+                    ;; A SEDOL is valid iff the checksum is a multiple of 10
+                    ;;
+                    (if (= 0 (modulo check 10)) (set! valid 1))
+                )
+            )
+            (display valid)(newline)
+            (main)
+        )
+    )
+)
+
+(main)
-- 
cgit 


From bfb91cde0d35322efb97ab84b223b4db6636c336 Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Fri, 22 Oct 2021 17:33:22 +0200
Subject: No need for int()

---
 challenge-135/abigail/awk/ch-1.awk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/challenge-135/abigail/awk/ch-1.awk b/challenge-135/abigail/awk/ch-1.awk
index 210b27b9b0..e446ce9669 100644
--- a/challenge-135/abigail/awk/ch-1.awk
+++ b/challenge-135/abigail/awk/ch-1.awk
@@ -25,4 +25,4 @@ length ($0) < 3 {print "too short";             next}
 # Print the middle three digits
 #
 
-                {print substr ($0, 1 + int ((length ($0) - 3) / 2), 3)}
+                {print substr ($0, 1 + (length ($0) - 3) / 2, 3)}
-- 
cgit 


From 3e4d6f828dbd3ee962d42d634b93d6790e18c686 Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Fri, 22 Oct 2021 18:35:43 +0200
Subject: Whitespace

---
 challenge-135/abigail/bash/ch-1.sh | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/challenge-135/abigail/bash/ch-1.sh b/challenge-135/abigail/bash/ch-1.sh
index d85a744a0c..31d8586a14 100644
--- a/challenge-135/abigail/bash/ch-1.sh
+++ b/challenge-135/abigail/bash/ch-1.sh
@@ -13,15 +13,11 @@ set -f
 while read line
 do   line=${line/#[-+]/}   # Get rid of sign
      if [[ $line =~ [^0-9] ]]
-     then
-         echo "not an integer"
+     then echo "not an integer"
      elif ((${#line} % 2 == 0))
-     then
-         echo "even number of digits"
+     then echo "even number of digits"
      elif ((${#line} < 3))
-     then
-         echo "too short"
-     else
-         echo ${line:$(((${#line} - 3) / 2)):3}
+     then echo "too short"
+     else echo ${line:$(((${#line} - 3) / 2)):3}
      fi
 done
-- 
cgit 


From 635033a4af3f3d2d24171d71e607d62e00b90155 Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Sat, 23 Oct 2021 01:02:40 +0200
Subject: Whitespace

---
 challenge-135/abigail/lua/ch-1.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/challenge-135/abigail/lua/ch-1.lua b/challenge-135/abigail/lua/ch-1.lua
index b5db984457..d986622640 100644
--- a/challenge-135/abigail/lua/ch-1.lua
+++ b/challenge-135/abigail/lua/ch-1.lua
@@ -20,7 +20,7 @@ for line in io . lines () do
                 print ("too short")
             else
                 local start = 1 + (line : len () - 3) / 2
-                print (line : sub (start , start + 2))
+                print (line : sub (start, start + 2))
             end
         end
     end
-- 
cgit 


From 137d500f76dc09e2d3f1f34142b93640d760159e Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Sat, 23 Oct 2021 21:18:05 +0200
Subject: Improve Perl solution for week 135/part 1.

---
 challenge-135/abigail/perl/ch-1.pl | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/challenge-135/abigail/perl/ch-1.pl b/challenge-135/abigail/perl/ch-1.pl
index a74d8655a5..878d686567 100644
--- a/challenge-135/abigail/perl/ch-1.pl
+++ b/challenge-135/abigail/perl/ch-1.pl
@@ -18,11 +18,12 @@ use experimental 'lexical_subs';
 #
 
 while (<>) {
-    s/^[-+]\s*//g;  # We don't care about signs.
-    say /^([0-9]*)([0-9]{3})([0-9]*)$
+    say /^[-+]?([0-9]*)([0-9]{3})([0-9]*)$
         (??{length ($1) == length ($3) ? "" : "(*FAIL)"})/x
-                      ? $2
-      : length () % 2 ? "even number of digits"
-      : length () < 4 ? "too short"
-      :                 "not an integer";
+                                  ? $2
+      : /^[-+]?[0-9]*[^0-9].*\n/  ? "not an integer"
+      : /^[-+]?(?:[0-9][0-9])*\n/ ? "even number of digits"
+      :                             "too short"
 }
+
+__END__
-- 
cgit 


From cc99394104e056b4951bb563ddac2119cc00a64c Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Sun, 24 Oct 2021 13:05:44 +0200
Subject: Initialize a variable before it is used

---
 challenge-135/abigail/c/ch-2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/challenge-135/abigail/c/ch-2.c b/challenge-135/abigail/c/ch-2.c
index 09b0b9fde9..ed33f0283f 100644
--- a/challenge-135/abigail/c/ch-2.c
+++ b/challenge-135/abigail/c/ch-2.c
@@ -23,7 +23,7 @@ int main (void) {
         if (str_len == 8) {
             int check = 0;
             for (size_t i = 0; i < 7 && valid; i ++) {
-                char first;
+                char first = 0;
                 if ('0' <= line_ptr [i] && line_ptr [i] <= '9') {
                     first = '0';
                 }
-- 
cgit 


From 9d0c7a33b83dd4d9120862fc5932c02525d3f2c5 Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Sun, 24 Oct 2021 19:50:25 +0200
Subject: Links to blog posts for week 135

---
 challenge-135/abigail/blog.txt  | 1 +
 challenge-135/abigail/blog1.txt | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 challenge-135/abigail/blog.txt
 create mode 100644 challenge-135/abigail/blog1.txt

diff --git a/challenge-135/abigail/blog.txt b/challenge-135/abigail/blog.txt
new file mode 100644
index 0000000000..1e0b3ac6ed
--- /dev/null
+++ b/challenge-135/abigail/blog.txt
@@ -0,0 +1 @@
+https://abigail.github.io/HTML/Perl-Weekly-Challenge/week-135-1.html
diff --git a/challenge-135/abigail/blog1.txt b/challenge-135/abigail/blog1.txt
new file mode 100644
index 0000000000..e2e0291ee3
--- /dev/null
+++ b/challenge-135/abigail/blog1.txt
@@ -0,0 +1 @@
+https://abigail.github.io/HTML/Perl-Weekly-Challenge/week-135-2.html
-- 
cgit