From 0124fc6acecedfcd77cd835289c36161bd7efcaa Mon Sep 17 00:00:00 2001
From: "a.pivkin" <a.pivkin@kek.azaza>
Date: Thu, 25 Dec 2025 21:11:11 +0300
Subject: [PATCH] sdf

---
 go_book/proj1/go.mod  |  2 ++
 go_book/proj1/go.sum  |  2 ++
 go_book/proj1/main.go | 28 ++++++++++++++++++++++------
 3 files changed, 26 insertions(+), 6 deletions(-)
 create mode 100644 go_book/proj1/go.sum

diff --git a/go_book/proj1/go.mod b/go_book/proj1/go.mod
index 529d5da..787a222 100644
--- a/go_book/proj1/go.mod
+++ b/go_book/proj1/go.mod
@@ -1,3 +1,5 @@
 module proj1
 
 go 1.24.5
+
+require go.uber.org/zap v1.27.1
diff --git a/go_book/proj1/go.sum b/go_book/proj1/go.sum
new file mode 100644
index 0000000..7729b1f
--- /dev/null
+++ b/go_book/proj1/go.sum
@@ -0,0 +1,2 @@
+go.uber.org/zap v1.27.1 h1:08RqriUEv8+ArZRYSTXy1LeBScaMpVSTBhCeaZYfMYc=
+go.uber.org/zap v1.27.1/go.mod h1:GB2qFLM7cTU87MWRP2mPIjqfIDnGu+VIO4V/SdhGo2E=
diff --git a/go_book/proj1/main.go b/go_book/proj1/main.go
index eb2ecdf..7f9ea4c 100644
--- a/go_book/proj1/main.go
+++ b/go_book/proj1/main.go
@@ -2,13 +2,29 @@ package main
 
 import (
 	"fmt"
-	"os"
-	// "strings"
+	"strconv"
+	"go.uber.org/zap/buffer"
 )
 
+func addCommas(n int) string {
+    str := strconv.Itoa(n)
+    
+    // Add commas from right to left
+    var result buffer.Buffer
+    for i := range str {
+        if i > 0 && (len(str)-i)%3 == 0 {
+				 fmt.Fprint(&result,",")
+        }
+        result.WriteByte(str[i])
+    }
+    
+    return result.String()
+}
+
 func main() {
-	// var sum string
-	for key,val := range os.Args[:]{
-		fmt.Println("num is",key,"value is", val)
-	}
+    numbers := []int{12345, 1234567, 987654321, 12345, 123, 0}
+    
+    for _, num := range numbers {
+        fmt.Printf("%d -> %s\n", num, addCommas(num))
+    }
 }
\ No newline at end of file