一文彻底搞清golang占位符

type Animal struct {
    hobby string
}

func main() {

    name := "xiaomotong"
    age := 19
    hh := Animal{"basketball"}

    fmt.Printf("name = %s , age = %d , hh = %vnn", name, age, hh)
    fmt.Printf("hh = %+v , hh= %#vnn", hh, hh)
    fmt.Printf("name = %T , age = %T , hh = %Tnn", name, age, hh)
    fmt.Printf("%q", 0x8989)
}

# go run main.go
name = xiaomotong , age = 19 , hh = {basketball}

hh = {hobby:basketball} , hh= main.Animal{hobby:"basketball"}

name = string , age = int , hh = main.Animal

'覉'

func main() {
    a := true
    num := 88
    uni := 0x8989

    fmt.Printf("%tn", a)
    fmt.Printf("%bn", num)
    fmt.Printf("%cn", 0x8989)
    fmt.Printf("uni = %U , uni = %#Un", uni, uni)
}

# go run main.go
true
1011000
覉
uni = U+8989 , uni = U+8989 '覉'

func main() {
    num := 888
    fNum := 888.99

    fmt.Printf("num = %2d , num = %07dn", num, num)
    fmt.Printf("num = %x , num = %#xn", num, num)
    fmt.Printf("num = %f  , num = %.3fn", fNum, fNum)
}

# go run main.go
num = 888 , num = 0000888
num = 378 , num = 0x378
num = 888.990000  , num = 888.990

func main() {
    ptr := "xiaomotong"
    fmt.Printf("ptr = %p , ptr = %#pn", &ptr, &ptr)
}

# go run main.go
ptr = 0xc42000e1e0 , ptr = c42000e1e0