From 6724f16bc1a3669b7499eedc32ce6c117ab2956e Mon Sep 17 00:00:00 2001
From: barryz <barryzxb@gmail.com>
Date: Sun, 7 Jan 2018 10:58:16 +0800
Subject: [PATCH] fix ch1.5 demo compile error

---
 ch1-basic/ch1-05-mem.md | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ch1-basic/ch1-05-mem.md b/ch1-basic/ch1-05-mem.md
index ed7712c..4ccb955 100644
--- a/ch1-basic/ch1-05-mem.md
+++ b/ch1-basic/ch1-05-mem.md
@@ -61,17 +61,21 @@ import (
 	"sync/atomic"
 )
 
-var total int64
+var total uint64
 
 func worker(wg *sync.WaitGroup) {
 	defer wg.Done()
 
-	for i := 0; i <= 100; i++ {
+	var i uint64
+	for i = 0; i <= 100; i++ {
 		atomic.AddUint64(&total, i)
 	}
 }
 
 func main() {
+	var wg sync.WaitGroup
+	wg.Add(2)
+
 	go worker(&wg)
 	go worker(&wg)
 	wg.Wait()