Method

package main
import "fmt"
type cat struct {
    color string
    gender byte
    age int
}
func (d cat) say() {
    fmt.Println(d.color, d.gender, d.age) //可用：fmt.Printf("%s %d %d", d.color, d.gender, d.age)
}
func main() {
    var b cat 
    b.color = "yellow"
    b.say()
}

yellow 0 0