diff --git a/kadai1/convert/conver.go b/kadai1/convert/conver.go
new file mode 100644
index 00000000..943470c4
--- /dev/null
+++ b/kadai1/convert/conver.go
@@ -0,0 +1,75 @@
+package convert
+
+import (
+	"fmt"
+	"image"
+	"image/gif"
+	_ "image/jpeg"
+	"image/png"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+//再帰的にファイルを読み込む
+func GetAllFile(pathname string, ipt []string) ([]string, error) {
+	rd, err := ioutil.ReadDir(pathname)
+	if err != nil {
+		fmt.Println("Failed to read dir:", err)
+		return ipt, err
+	}
+	for _, fi := range rd {
+		if fi.IsDir() {
+			fullDir := pathname + "/" + fi.Name()
+			ipt, err = GetAllFile(fullDir, ipt)
+			if err != nil {
+				fmt.Println("Failed to read dir:", err)
+				return ipt, err
+			}
+		} else {
+			fullName := pathname + "/" + fi.Name()
+			ipt = append(ipt, fullName)
+		}
+	}
+	return ipt, nil
+}
+
+//画像の形式を変換する
+func Conv(ipt, opt string) (s string, err error) {
+	s1 := "right"
+	file, err := os.Open(ipt)
+	if err != nil {
+		return s1, err
+	}
+	//assert(err, "Invalid image file path ")
+	defer file.Close()
+
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return s1, err
+	}
+	//assert(err, "Failed to convert file to image.")
+
+	out, err := os.Create(opt)
+	if err != nil {
+		return s1, err
+	}
+	defer out.Close()
+
+	switch filepath.Ext(opt) {
+	case ".png":
+		err = png.Encode(out, img)
+	case ".gif":
+		err = gif.Encode(out, img, nil)
+	}
+	if err != nil {
+		return s1, err
+	}
+	return s1, nil
+}
+
+//func assert(err error, msg string) {
+//	if err != nil {
+//		panic(err.Error() + ":" + msg)
+//	}
+//}
diff --git a/kadai1/convert/conver_test.go b/kadai1/convert/conver_test.go
new file mode 100644
index 00000000..c3dc11f4
--- /dev/null
+++ b/kadai1/convert/conver_test.go
@@ -0,0 +1,47 @@
+package convert
+
+import (
+	"convert"
+	"path/filepath"
+	"testing"
+)
+
+func TestAllfile(t *testing.T) {
+	t.Helper()
+	var s []string
+	output, _ := GetAllFile("./img", s)
+	if len(output) != 15 {
+		t.Errorf("Image file does not complete readed,expected 15,but %v ", len(output)) //画像の枚数が違う
+	}
+}
+
+func TestTableAllfile(t *testing.T) {
+	t.Helper()
+	var s []string
+	var tests = []struct {
+		pathinput string
+		expect    int
+	}{
+		{"./img/img_test1", 3},
+		{"./img/img_test2", 4},
+		{"./img/img_test3", 5},
+	}
+	for _, te := range tests {
+		output, _ := GetAllFile(te.pathinput, s)
+		if len(output) != te.expect {
+			t.Errorf("Image file does not complete readed,expected %v,but %v ", tests[1], len(output)) //画像の枚数が違う
+		}
+	}
+}
+
+func TestConv(t *testing.T) {
+	t.Helper()
+	err := convert.Conv("./img/1.0.jpg", "./img/1.0.png")
+	if err != nil {
+		t.Errorf("error happened %v", err)
+	}
+	matches, _ := filepath.Glob("./img/*.png")
+	if matches == nil {
+		t.Errorf("Image file does not converted %v", matches)
+	}
+}
diff --git a/kadai1/convert/img/1.0.jpg b/kadai1/convert/img/1.0.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/1.0.jpg differ
diff --git a/kadai1/convert/img/1.1.jpg b/kadai1/convert/img/1.1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/1.1.jpg differ
diff --git a/kadai1/convert/img/1.2.jpg b/kadai1/convert/img/1.2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/1.2.jpg differ
diff --git a/kadai1/convert/img/img_test1/1.jpg b/kadai1/convert/img/img_test1/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test1/1.jpg differ
diff --git a/kadai1/convert/img/img_test1/2.jpg b/kadai1/convert/img/img_test1/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test1/2.jpg differ
diff --git a/kadai1/convert/img/img_test1/3.jpg b/kadai1/convert/img/img_test1/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test1/3.jpg differ
diff --git a/kadai1/convert/img/img_test2/1.jpg b/kadai1/convert/img/img_test2/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test2/1.jpg differ
diff --git a/kadai1/convert/img/img_test2/2.jpg b/kadai1/convert/img/img_test2/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test2/2.jpg differ
diff --git a/kadai1/convert/img/img_test2/3.jpg b/kadai1/convert/img/img_test2/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test2/3.jpg differ
diff --git a/kadai1/convert/img/img_test2/4.jpg b/kadai1/convert/img/img_test2/4.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test2/4.jpg differ
diff --git a/kadai1/convert/img/img_test3/1.jpg b/kadai1/convert/img/img_test3/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test3/1.jpg differ
diff --git a/kadai1/convert/img/img_test3/2.jpg b/kadai1/convert/img/img_test3/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test3/2.jpg differ
diff --git a/kadai1/convert/img/img_test3/3.jpg b/kadai1/convert/img/img_test3/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test3/3.jpg differ
diff --git a/kadai1/convert/img/img_test3/4.jpg b/kadai1/convert/img/img_test3/4.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test3/4.jpg differ
diff --git a/kadai1/convert/img/img_test3/5.jpg b/kadai1/convert/img/img_test3/5.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/convert/img/img_test3/5.jpg differ
diff --git a/kadai1/go.mod b/kadai1/go.mod
new file mode 100644
index 00000000..ea118c73
--- /dev/null
+++ b/kadai1/go.mod
@@ -0,0 +1,3 @@
+module image.go
+
+go 1.16
diff --git a/kadai1/img/1.0.jpg b/kadai1/img/1.0.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/img/1.0.jpg differ
diff --git a/kadai1/img/1.1.jpg b/kadai1/img/1.1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/img/1.1.jpg differ
diff --git a/kadai1/img/1.2.jpg b/kadai1/img/1.2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/img/1.2.jpg differ
diff --git a/kadai1/img/img_test/1.jpg b/kadai1/img/img_test/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/img/img_test/1.jpg differ
diff --git a/kadai1/img/img_test/2.jpg b/kadai1/img/img_test/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/img/img_test/2.jpg differ
diff --git a/kadai1/img/img_test/3.jpg b/kadai1/img/img_test/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai1/img/img_test/3.jpg differ
diff --git a/kadai1/main.go b/kadai1/main.go
new file mode 100644
index 00000000..9219dbb9
--- /dev/null
+++ b/kadai1/main.go
@@ -0,0 +1,39 @@
+/*This is a training code for learning Go language.
+And this code can change the format of images as you like*/
+package main
+
+import (
+	"bufio"
+	"convert"
+	"fmt"
+	"os"
+	"strings"
+)
+
+type oriPath struct {
+	inputPA  string
+	outputPA string
+}
+
+func main() {
+	var a oriPath
+	a.inputPA = "./img"
+	a.outputPA = "./img"
+	scanner := bufio.NewScanner(os.Stdin)
+	fmt.Print("Input the image format you want(like png or gif):")
+	if !scanner.Scan() {
+		fmt.Println("Please input the format.")
+		return
+	}
+	srcPath := scanner.Text()
+
+	var s []string
+	s, _ = convert.GetAllFile(a.inputPA, s)
+	for _, i := range s {
+		j := strings.Replace(i, "jpg", srcPath, -1) //jpgから任意の形式へ変換する
+		err := convert.Conv(i, j)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s\n", err.Error())
+		}
+	}
+}
diff --git a/kadai2/convert/conver.go b/kadai2/convert/conver.go
new file mode 100644
index 00000000..943470c4
--- /dev/null
+++ b/kadai2/convert/conver.go
@@ -0,0 +1,75 @@
+package convert
+
+import (
+	"fmt"
+	"image"
+	"image/gif"
+	_ "image/jpeg"
+	"image/png"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+//再帰的にファイルを読み込む
+func GetAllFile(pathname string, ipt []string) ([]string, error) {
+	rd, err := ioutil.ReadDir(pathname)
+	if err != nil {
+		fmt.Println("Failed to read dir:", err)
+		return ipt, err
+	}
+	for _, fi := range rd {
+		if fi.IsDir() {
+			fullDir := pathname + "/" + fi.Name()
+			ipt, err = GetAllFile(fullDir, ipt)
+			if err != nil {
+				fmt.Println("Failed to read dir:", err)
+				return ipt, err
+			}
+		} else {
+			fullName := pathname + "/" + fi.Name()
+			ipt = append(ipt, fullName)
+		}
+	}
+	return ipt, nil
+}
+
+//画像の形式を変換する
+func Conv(ipt, opt string) (s string, err error) {
+	s1 := "right"
+	file, err := os.Open(ipt)
+	if err != nil {
+		return s1, err
+	}
+	//assert(err, "Invalid image file path ")
+	defer file.Close()
+
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return s1, err
+	}
+	//assert(err, "Failed to convert file to image.")
+
+	out, err := os.Create(opt)
+	if err != nil {
+		return s1, err
+	}
+	defer out.Close()
+
+	switch filepath.Ext(opt) {
+	case ".png":
+		err = png.Encode(out, img)
+	case ".gif":
+		err = gif.Encode(out, img, nil)
+	}
+	if err != nil {
+		return s1, err
+	}
+	return s1, nil
+}
+
+//func assert(err error, msg string) {
+//	if err != nil {
+//		panic(err.Error() + ":" + msg)
+//	}
+//}
diff --git a/kadai2/convert/conver_test.go b/kadai2/convert/conver_test.go
new file mode 100644
index 00000000..c3dc11f4
--- /dev/null
+++ b/kadai2/convert/conver_test.go
@@ -0,0 +1,47 @@
+package convert
+
+import (
+	"convert"
+	"path/filepath"
+	"testing"
+)
+
+func TestAllfile(t *testing.T) {
+	t.Helper()
+	var s []string
+	output, _ := GetAllFile("./img", s)
+	if len(output) != 15 {
+		t.Errorf("Image file does not complete readed,expected 15,but %v ", len(output)) //画像の枚数が違う
+	}
+}
+
+func TestTableAllfile(t *testing.T) {
+	t.Helper()
+	var s []string
+	var tests = []struct {
+		pathinput string
+		expect    int
+	}{
+		{"./img/img_test1", 3},
+		{"./img/img_test2", 4},
+		{"./img/img_test3", 5},
+	}
+	for _, te := range tests {
+		output, _ := GetAllFile(te.pathinput, s)
+		if len(output) != te.expect {
+			t.Errorf("Image file does not complete readed,expected %v,but %v ", tests[1], len(output)) //画像の枚数が違う
+		}
+	}
+}
+
+func TestConv(t *testing.T) {
+	t.Helper()
+	err := convert.Conv("./img/1.0.jpg", "./img/1.0.png")
+	if err != nil {
+		t.Errorf("error happened %v", err)
+	}
+	matches, _ := filepath.Glob("./img/*.png")
+	if matches == nil {
+		t.Errorf("Image file does not converted %v", matches)
+	}
+}
diff --git a/kadai2/convert/img/1.0.jpg b/kadai2/convert/img/1.0.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/1.0.jpg differ
diff --git a/kadai2/convert/img/1.1.jpg b/kadai2/convert/img/1.1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/1.1.jpg differ
diff --git a/kadai2/convert/img/1.2.jpg b/kadai2/convert/img/1.2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/1.2.jpg differ
diff --git a/kadai2/convert/img/img_test1/1.jpg b/kadai2/convert/img/img_test1/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test1/1.jpg differ
diff --git a/kadai2/convert/img/img_test1/2.jpg b/kadai2/convert/img/img_test1/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test1/2.jpg differ
diff --git a/kadai2/convert/img/img_test1/3.jpg b/kadai2/convert/img/img_test1/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test1/3.jpg differ
diff --git a/kadai2/convert/img/img_test2/1.jpg b/kadai2/convert/img/img_test2/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test2/1.jpg differ
diff --git a/kadai2/convert/img/img_test2/2.jpg b/kadai2/convert/img/img_test2/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test2/2.jpg differ
diff --git a/kadai2/convert/img/img_test2/3.jpg b/kadai2/convert/img/img_test2/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test2/3.jpg differ
diff --git a/kadai2/convert/img/img_test2/4.jpg b/kadai2/convert/img/img_test2/4.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test2/4.jpg differ
diff --git a/kadai2/convert/img/img_test3/1.jpg b/kadai2/convert/img/img_test3/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test3/1.jpg differ
diff --git a/kadai2/convert/img/img_test3/2.jpg b/kadai2/convert/img/img_test3/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test3/2.jpg differ
diff --git a/kadai2/convert/img/img_test3/3.jpg b/kadai2/convert/img/img_test3/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test3/3.jpg differ
diff --git a/kadai2/convert/img/img_test3/4.jpg b/kadai2/convert/img/img_test3/4.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test3/4.jpg differ
diff --git a/kadai2/convert/img/img_test3/5.jpg b/kadai2/convert/img/img_test3/5.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/convert/img/img_test3/5.jpg differ
diff --git a/kadai2/go.mod b/kadai2/go.mod
new file mode 100644
index 00000000..ea118c73
--- /dev/null
+++ b/kadai2/go.mod
@@ -0,0 +1,3 @@
+module image.go
+
+go 1.16
diff --git a/kadai2/img/1.0.jpg b/kadai2/img/1.0.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/img/1.0.jpg differ
diff --git a/kadai2/img/1.1.jpg b/kadai2/img/1.1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/img/1.1.jpg differ
diff --git a/kadai2/img/1.2.jpg b/kadai2/img/1.2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/img/1.2.jpg differ
diff --git a/kadai2/img/img_test/1.jpg b/kadai2/img/img_test/1.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/img/img_test/1.jpg differ
diff --git a/kadai2/img/img_test/2.jpg b/kadai2/img/img_test/2.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/img/img_test/2.jpg differ
diff --git a/kadai2/img/img_test/3.jpg b/kadai2/img/img_test/3.jpg
new file mode 100644
index 00000000..b168a75b
Binary files /dev/null and b/kadai2/img/img_test/3.jpg differ
diff --git a/kadai2/main.go b/kadai2/main.go
new file mode 100644
index 00000000..9219dbb9
--- /dev/null
+++ b/kadai2/main.go
@@ -0,0 +1,39 @@
+/*This is a training code for learning Go language.
+And this code can change the format of images as you like*/
+package main
+
+import (
+	"bufio"
+	"convert"
+	"fmt"
+	"os"
+	"strings"
+)
+
+type oriPath struct {
+	inputPA  string
+	outputPA string
+}
+
+func main() {
+	var a oriPath
+	a.inputPA = "./img"
+	a.outputPA = "./img"
+	scanner := bufio.NewScanner(os.Stdin)
+	fmt.Print("Input the image format you want(like png or gif):")
+	if !scanner.Scan() {
+		fmt.Println("Please input the format.")
+		return
+	}
+	srcPath := scanner.Text()
+
+	var s []string
+	s, _ = convert.GetAllFile(a.inputPA, s)
+	for _, i := range s {
+		j := strings.Replace(i, "jpg", srcPath, -1) //jpgから任意の形式へ変換する
+		err := convert.Conv(i, j)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s\n", err.Error())
+		}
+	}
+}
diff --git a/kadai3-1/go.mod b/kadai3-1/go.mod
new file mode 100644
index 00000000..304c88f7
--- /dev/null
+++ b/kadai3-1/go.mod
@@ -0,0 +1,3 @@
+module main.go
+
+go 1.16
diff --git a/kadai3-1/main.go b/kadai3-1/main.go
new file mode 100644
index 00000000..df7f072b
--- /dev/null
+++ b/kadai3-1/main.go
@@ -0,0 +1,62 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"math/rand"
+	"os"
+	"time"
+)
+
+var t int
+
+//制限時間をオプションにする
+func init() {
+	flag.IntVar(&t, "t", 20, "制限時間s")
+	flag.Parse()
+}
+
+func main() {
+	fmt.Println("タイピングゲームが始まった！制限時間", t, "s")
+	num, score := 0, 0
+	timeout := time.After(time.Second * time.Duration(t))
+	for sign := true; sign == true; {
+		word := RandomWord()
+		num++
+		fmt.Println("単語NO:", num, "この英単語をタイピングしてください：", word)
+		c := imp(os.Stdin)
+		select {
+		case right := <-c:
+			if right == word {
+				fmt.Println("正解です！")
+				score++
+			} else {
+				fmt.Println("残念、不正解です。")
+			}
+		case <-timeout:
+			fmt.Println("時間です！")
+			sign = false
+		}
+	}
+	fmt.Println("ゲーム終了！ やった単語数", num, " 時間内に正確単語数：", score)
+}
+
+//英単語をランダムに取り出す
+func RandomWord() (word string) {
+	words := []string{"banana", "apple", "milk", "fruits", "cat", "car", "elephant", "unbralla", "interface", "tissues", "format"}
+	rand.Seed(time.Now().Unix())
+	num := rand.Intn(len(words))
+	return words[num]
+}
+
+//入力単語を取得する
+func imp(r io.Reader) <-chan string {
+	wordCh := make(chan string, 1)
+	scanner := bufio.NewScanner(r)
+	scanner.Scan()
+	wordCh <- scanner.Text()
+	//close(wordCh)
+	return wordCh
+}
diff --git a/kadai3-1/main_test.go b/kadai3-1/main_test.go
new file mode 100644
index 00000000..e33aa9c2
--- /dev/null
+++ b/kadai3-1/main_test.go
@@ -0,0 +1,12 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestRandomWord(t *testing.T) {
+	word := RandomWord()
+	if word == nil {
+		t.Error("文字取り出さない")
+	}
+}
diff --git a/kadai3-2/download.go b/kadai3-2/download.go
new file mode 100644
index 00000000..735324fc
--- /dev/null
+++ b/kadai3-2/download.go
@@ -0,0 +1,150 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"sync"
+	"time"
+)
+
+const size = 4 //分割の数
+var muex sync.Mutex
+var wg = sync.WaitGroup{}
+var t int
+var url, fileph, dpath, spath string
+
+func init() {
+	flag.IntVar(&t, "t", 10, "制限時間m")
+	flag.StringVar(&dpath, "p", "https://www.robots.ox.ac.uk/~vgg/data/paintings/painting_dataset_2014.xlsx", "ダウンローダアドレス")
+	flag.StringVar(&spath, "s", "./painting_dataset_2014.xlsx", "保存アドレスとname")
+	flag.Parse()
+}
+
+func main() {
+	fmt.Println("ダウンロードスタート...制限時間", t, "m")
+	url = dpath
+	fileph = spath
+	datetime := time.Now()
+	fmt.Println(datetime)
+	filelen := Getfilelen()
+	fmt.Println("ファイルサイズ：", calculatelen(filelen))
+	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(t)*time.Minute)
+	file, err := os.Create(fileph)
+	if err != nil {
+		panic(err)
+	}
+	part := filelen/size + 1 //startとendを指定する
+	work(url, file, filelen, part, ctx)
+	defer file.Close()
+	cancel()
+	fmt.Println("ダウンロード終了。")
+	datetime2 := time.Now()
+	fmt.Println(datetime2)
+}
+
+func work(url string, file *os.File, filelen int, part int, ctx context.Context) {
+	ch := make(chan int, 1)
+	for j := 0; j < size; j++ {
+		ch <- j
+		select {
+		case <-ctx.Done():
+			fmt.Println("時間を超え、ダウンロード停止")
+			return
+		case <-ch:
+			Download(url, file, filelen, j, part)
+		}
+	}
+	close(ch)
+}
+
+//ダウンロード機能
+func Download(url string, file *os.File, filelen int, i int, part int) {
+	var start, end int
+	fmt.Println(strconv.Itoa(i) + "番目の部分をダウンロードスタート")
+	muex.Lock()
+	client := &http.Client{}
+	req, err := http.NewRequest("GET", url, nil)
+
+	if i != 0 { //rangeのstartとendを指定
+		start = i*part + 1
+	} else {
+		start = 0
+	}
+	if i+1 == size {
+		end = filelen
+	} else {
+		end = (i + 1) * part
+	}
+
+	str := strconv.FormatInt(int64(start), 10) + "-" + strconv.FormatInt(int64(end), 10)
+	fmt.Println("Range"+strconv.Itoa(i), "byte="+str)
+	req.Header.Set("Range", "bytes="+str)
+	resp, err := client.Do(req)
+	if err != nil {
+		log.Printf("client.Do err:%v", err)
+	}
+
+	fmt.Println(strconv.Itoa(i)+"番目のダウンロードの長さ:", resp.Header.Get("Content-Length"))
+	op, err := file.Seek(int64(start), 0)
+	fmt.Println("今までダウンロードの長さ:", op)
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Printf("read file error: %v", err)
+	}
+	if len(body) == 0 {
+		fmt.Println("no file")
+	}
+	len, err := file.Write(body)
+	fmt.Println(strconv.Itoa(i)+"番目のファイルを書き込み、長さ：", len)
+	resp.Body.Close()
+	muex.Unlock()
+}
+
+//ファイルの長さを取得
+func Getfilelen() (filelen int) {
+	resp, err := http.Get(string(url))
+	if err != nil {
+		panic(err)
+	}
+
+	filelenStr, ext := resp.Header["Content-Length"]
+	if !ext || len(filelenStr) == 0 {
+		filelenStr = []string{"0"}
+	}
+
+	filelen, fileerr := strconv.Atoi(filelenStr[0])
+	fmt.Println("ファイルの長さ：", filelen)
+	if fileerr != nil {
+		fmt.Println(fileerr)
+		filelen = 0
+		fmt.Println("ファイルサイズ未知")
+	}
+	return filelen
+}
+
+//ファイルサイズを計算する
+func calculatelen(len int) string {
+	if len < 1024 {
+		return fmt.Sprintf("%d Btye", len)
+	}
+	kb := float32(len) / 1024
+	if kb < 1024 {
+		return fmt.Sprintf("%f Kb", kb)
+	}
+	mb := kb / 1024
+	if mb < 1024 {
+		return fmt.Sprintf("%f Mb", mb)
+	}
+	gb := mb / 1024
+	if mb < 1024 {
+		return fmt.Sprintf("%f GB", gb)
+	}
+	return fmt.Sprintf("%f PB", gb/1024)
+}