golang怎么写代码

var i int // 默认值为0
i = 10 

j := "Hello World" // 自动推导类型为string

const (
    Pi     = 3.14159265358979323846
    Apples = 1 << iota  // Apples的值是1左移0位，即1
    Oranges            // Oranges的值是1左移1位，即2
    Bananas            // Bananas的值是1左移2位，即4
)

if i > 10 {
    fmt.Println("i is greater than 10")
} else {
    fmt.Println("i is less than or equal to 10")
}

switch {
    case i < 0:
        fmt.Println("i is negative")
    case i > 0:
        fmt.Println("i is positive")
    default:
        fmt.Println("i is zero")
}

for i := 0; i < 10; i++ {
    fmt.Println(i)
}

// 跳转语句
goto label1
fmt.Println("this line will never get executed")
label1:
fmt.Println("jumped to label1")

// 数组
var arr [5]int
for i := 0; i < 5; i++ {
    arr[i] = i
}

// 切片的创建和操作
var slice1 []int = arr[1:3]
slice2 := make([]int, 5, 10) // 第2个参数是长度，第三个参数是容量
slice2 = append(slice2, 1, 2, 3)

type Person struct {
    name string
    age  int
}

func (p Person) SayHello() {
    fmt.Println("Hello, my name is", p.name, ", and I am", p.age, "years old.")
}

func main() {
    p := Person{name: "Alice", age: 30}
    p.SayHello()
    pp := &p
    fmt.Println(pp.age)
}

type Animal interface {
    Speak() string
}

type Dog struct {
    name string
}

func (d Dog) Speak() string {
    return "Woof! I am " + d.name
}

func main() {
    d := Dog{"Fido"}
    fmt.Println(d.Speak())
}

func worker(id int, c chan int) {
    for {
        n, ok := <-c
        if !ok {
            break
        }
        fmt.Printf("Worker %d received %d
", id, n)
    }
    fmt.Printf("Worker %d is done
", id)
}

func createWorker(id int) chan<- int {
    c := make(chan int)
    go worker(id, c)
    return c
}

func main() {
    c := make(chan int)
    var wg sync.WaitGroup
    for i := 0; i < 10; i++ {
        wg.Add(1)
        go func(id int) {
            c := createWorker(id)
            for j := 0; j < 10; j++ {
                c <- j
            }
            wg.Done()
        }(i)
    }
    wg.Wait()
    close(c)
    time.Sleep(time.Second)
}