diff --git a/day05/log/__debug_bin512404649.exe b/day05/log/__debug_bin512404649.exe
new file mode 100644
index 0000000..7b513e2
Binary files /dev/null and b/day05/log/__debug_bin512404649.exe differ
diff --git a/day05/log/log.exe b/day05/log/log.exe
new file mode 100644
index 0000000..fa9eeee
Binary files /dev/null and b/day05/log/log.exe differ
diff --git a/day05/log/main.go b/day05/log/main.go
new file mode 100644
index 0000000..75bbba5
--- /dev/null
+++ b/day05/log/main.go
@@ -0,0 +1,56 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+// 写文件
+// writefile
+func writefilebufio() {
+	file, err := os.OpenFile("./xx.txt", os.O_APPEND|os.O_CREATE, 0644)
+	if err != nil {
+		fmt.Println("input error! err:%v", err)
+		return
+	}
+	defer file.Close()
+	writer := bufio.NewWriter(file)
+	for i := 0; i < 1; i++ {
+		writer.WriteString("writer")
+	}
+	writer.Flush()
+}
+
+func writefileioutil() {
+	str := "wangsss"
+	err := ioutil.WriteFile("./xx.txt", []byte(str), 0644)
+	if err != nil {
+		fmt.Printf("open file failed,err :%v", err)
+		return
+	}
+}
+
+func writefile() {
+	file, err := os.OpenFile("./xx.txt", os.O_APPEND|os.O_CREATE, 0644)
+	if err != nil {
+		fmt.Printf("open file failed,err :%v", err)
+		return
+	}
+	// fmt.Println(file)
+	//write
+	file.Write([]byte("吱吱吱!"))
+	file.WriteString("萨瓦迪卡！")
+	file.Close()
+}
+
+func main() {
+	var s string
+	reader := bufio.NewReader(os.Stdin)
+	s, _ = reader.ReadString('\n')
+	//直到读到了\n换行符为止
+	fmt.Printf("您输入的是%s", s)
+	file, _ := os.OpenFile("./xx.txt", os.O_APPEND|os.O_CREATE, 0644)
+	fmt.Fprintln(file, s)
+}