init

.gitignore

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+
+/.idea
+/.gitignore

day1/day-1.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello")
+}
+
+//1.修改 echo 程序，使其能够打印 os.Args[0]，即被执行命令本身的名字。
+//切片第一个参数改为0
+
+//2.练习 1.2： 修改 echo 程序，使其打印每个参数的索引和值，每个一行。
+//空格改为 控制符 \n
+
+//3.练习 1.3： 做实验测量潜在低效的版本和使用了 strings.Join 的版本的运行时间差异。（1.6 节讲解了部分 time 包，11.4 节展示了如何写标准测试程序，以得到系统性的性能评测。）

day1/echo1.go

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+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	var s, sep string
+	for i := 1; i < len(os.Args); i++ {
+		s += sep + os.Args[i]
+		sep = " "
+	}
+	fmt.Println(s)
+}

day1/echo2.go

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+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	var s, sep string
+	for _, arg := range os.Args[1:] {
+		s += sep + arg
+		sep = " "
+	}
+	fmt.Println(s)
+
+}

day1/echo3.go

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+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	fmt.Println(strings.Join(os.Args[0:], "\n"))
+}

day2/dup1.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	counts := make(map[string]int)
+	input := bufio.NewScanner(os.Stdin)
+	for input.Scan() {
+		counts[input.Text()]++
+		fmt.Println(counts)
+	}
+	for line, n := range counts {
+		if n > 1 {
+			fmt.Printf("%d\t%s\n", n, line)
+		}
+	}
+
+}

day2/dup2.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	counts := make(map[string]int)
+	files := os.Args[1:]
+	fmt.Println(files)
+	if len(files) == 0 {
+		fmt.Println("...")
+	} else {
+		for _, arg := range files {
+			f, err := os.Open(arg)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "dup2: %v \n", err)
+				continue
+			}
+			countLines(f, counts)
+			f.Close()
+		}
+	}
+	for line, n := range counts {
+		if n > 1 {
+			fmt.Printf("%d\t%s\n", n, line)
+		}
+	}
+}
+
+func countLines(f *os.File, counts map[string]int) {
+	input := bufio.NewScanner(f)
+	for input.Scan() {
+		counts[input.Text()]++
+
+	}
+}

day2/dup3.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+func main() {
+	counts := make(map[string]int)
+	for _, filename := range os.Args[1:] {
+		data, err := ioutil.ReadFile(filename)
+		if err != nil {
+			fmt.Println(os.Stderr, "dup3 : %v", err)
+			continue
+		}
+		for _, line := range strings.Split(string(data), "\n") {
+			counts[line]++
+		}
+		for line, n := range counts {
+			if n > 1 {
+				fmt.Printf("%d\t%s\n", n, line)
+			}
+		}
+	}
+}

day2/fetch.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	. "net/http"
+	"os"
+)
+
+func main() {
+	for _, url := range os.Args[1:] {
+		resp, err := Get(url)
+		if err != nil {
+			fmt.Fprintf(os.Stderr,
+				"Fetch: %v", err)
+			os.Exit(1)
+		}
+		b, err := ioutil.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			fmt.Fprintf(os.Stderr,
+				"Fetch: %s as %v", url, err)
+			os.Exit(1)
+		}
+		fmt.Printf("%s\n", b)
+
+	}
+}

day2/lissajous.go

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+package main
+
+import (
+	"image"
+	"image/color"
+	"image/gif"
+	"io"
+	"math"
+	"math/rand"
+	"os"
+	"time"
+)
+
+var palette = []color.Color{color.Black,
+	color.RGBA{G: 0xff, A: 0xff}}
+
+const (
+	whiteIndex = 0
+	blackIndex = 1
+)
+
+func main() {
+	rand.Seed(time.Now().UTC().UnixNano())
+	lissajous(os.Stdout)
+}
+
+func lissajous(out io.Writer) {
+	const (
+		cycles  = 5
+		res     = 0.001
+		size    = 100
+		nframes = 64
+		delay   = 8
+	)
+
+	freq := rand.Float64() * 3.0
+	anim := gif.GIF{LoopCount: nframes}
+	phase := 0.0
+	for i := 0; i < nframes; i++ {
+		rect := image.Rect(0, 0,
+			2*size+1, 2*size+1)
+
+		img := image.NewPaletted(rect, palette)
+
+		for t := 0.0; t < cycles*2*math.Pi; t += res {
+			x := math.Sin(t)
+			y := math.Sin(t*freq + phase)
+			img.SetColorIndex(size+int(x*size+0.5),
+				size+int(y*size+0.5), blackIndex)
+		}
+		phase += 0.1
+		anim.Delay = append(anim.Delay, delay)
+		anim.Image = append(anim.Image, img)
+	}
+	gif.EncodeAll(out, &anim)
+
+}

day2/practice1.7.go

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+package main
+
+import (
+	"fmt"
+	"io"
+	. "net/http"
+	"os"
+)
+
+func main() {
+	for _, url := range os.Args[1:] {
+		resp, err := Get(url)
+		if err != nil {
+			fmt.Fprintf(os.Stderr,
+				"Fetch: %v", err)
+			os.Exit(1)
+		}
+
+		_, err = io.Copy(os.Stdout, resp.Body)
+		if err != nil {
+			fmt.Fprintf(os.Stderr,
+				"Fetch: %s as %v", url, err)
+			os.Exit(1)
+		}
+		resp.Body.Close()
+	}
+}

day2/practice1.8.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+)
+
+func main() {
+	CheckArgsHttp(os.Args[1:]) //1.8
+	for _, url := range os.Args[1:] {
+		resp, err := http.Get(url)
+		if err != nil {
+			fmt.Fprintf(os.Stderr,
+				"Fetch: %v", err)
+			os.Exit(1)
+		}
+		// 获得http协议状态码
+		fmt.Printf("%s status:%s code:%d \n", url, resp.Status, resp.StatusCode)
+		//_, err = io.Copy(os.Stdout, resp.Body)
+		//if err != nil{
+		//	fmt.Fprintf(os.Stderr,
+		//		"Fetch: %s as %v", url,err)
+		//	os.Exit(1)
+		//}
+		//resp.Body.Close()
+	}
+}
+func CheckArgsHttp(args []string) {
+	for i, _ := range args {
+		// 去除 空格
+		args[i] = strings.TrimSpace(args[i])
+		// 去除 /
+		args[i] = strings.Trim(args[i], "/")
+		// 添加 http前缀
+		if strings.HasPrefix(args[i], "http") == false {
+			args[i] = "http://" + args[i]
+		}
+		fmt.Println(args[i])
+	}
+}

day2/test.txt

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+test 30
+test 30
+test 30
+Hello 95
+Hello 95
+
+
+Hello 95
+Hello 95
+Linux 85
+Linux 85
+
+
+

day2/test1.txt

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+test 30
+test 30
+test 30
+Hello 95
+Hello 95
+Hello 95
+Hello 95
+Linux 85
+Linux 85
+Linux 85
+
+