From ff65becf7b552efa4bfc381020b85f449d1f3ef2 Mon Sep 17 00:00:00 2001
From: Daniel Aberger <da@ixab.de>
Date: Thu, 28 Apr 2022 16:56:42 +0200
Subject: add week 162, ch-1 in Go

---
 challenge-162/daniel-aberger/README     |  2 ++
 challenge-162/daniel-aberger/go/ch-1.go | 43 +++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 challenge-162/daniel-aberger/README
 create mode 100644 challenge-162/daniel-aberger/go/ch-1.go

diff --git a/challenge-162/daniel-aberger/README b/challenge-162/daniel-aberger/README
new file mode 100644
index 0000000000..67c2817654
--- /dev/null
+++ b/challenge-162/daniel-aberger/README
@@ -0,0 +1,2 @@
+Solutions by Daniel Aberger.
+
diff --git a/challenge-162/daniel-aberger/go/ch-1.go b/challenge-162/daniel-aberger/go/ch-1.go
new file mode 100644
index 0000000000..ef46a5d6f8
--- /dev/null
+++ b/challenge-162/daniel-aberger/go/ch-1.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	input := os.Args[1]
+	isbn := make([]int, 0)
+	for _, r := range input {
+		i, err := strconv.Atoi(string(r))
+		if err != nil {
+			continue
+		}
+		isbn = append(isbn, i)
+	}
+	if len(isbn) < 12 || len(isbn) > 13 {
+		fmt.Println("ISBN malformed")
+		os.Exit(1)
+	}
+	sum := 0
+	for k, v := range isbn {
+		if k == 12 {
+			break
+		}
+		if k%2 == 1 {
+			sum += v * 3
+		} else {
+			sum += v
+		}
+	}
+	if len(isbn) == 13 {
+		if 10-sum%10 == isbn[12] {
+			fmt.Println("correct checksum!")
+		} else {
+			fmt.Println("incorrect checksum!")
+		}
+	} else {
+		fmt.Printf("checksum: %d\n", 10-sum%10)
+	}
+}
-- 
cgit