Go语言里的结构体文法实例分析

package main
import "fmt"
type Vertex struct {
    X, Y int
}
var (
    p = Vertex{1, 2}  // has type Vertex
    q = &Vertex{1, 2} // has type *Vertex
    r = Vertex{X: 1}  // Y:0 is implicit
    s = Vertex{}      // X:0 and Y:0
)
func main() {
    fmt.Println(p, q, r, s)
}