Go-指针、传值与传引用、垃圾回收

package main
import "fmt"

/*
D:\examples>go run helloworld.go
10
100
5
100

D:\examples>
*/
func main() {
    i := 10 

    pass_by_value(i)
    fmt.Println(i)

    pass_by_reference(&i)
    fmt.Println(i)

    x := new(int)
    *x = 5 
    fmt.Println(*x)

    pass_by_reference(x)
    fmt.Println(*x)
}

func pass_by_value(i int) {
    i = 100
}

func pass_by_reference(i *int) {
    *i = 100
}