package?main

import?"fmt"

func?main(){
???var?n?[]int
???printslice(n)

???n?=?append(n,0)
???printslice(n)

???n?=?append(n,1)
???printslice(n)

??
????n?=?append(n,2,3,4)
??????printslice(n)

???n1?:=?make([]int,len(n),(cap(n))*2)
???copy(n1,n)
???printslice(n1)

}

func?printslice(x?[]int){
???fmt.Printf("len?=?%d,cap?=?%d,slice?=?%d\n",len(x),cap(x),x)
???
???len?=?0,cap?=?0,slice?=?[]
???len?=?1,cap?=?1,slice?=?[0]
???len?=?2,cap?=?2,slice?=?[0?1]
???len?=?5,cap?=?6,slice?=?[0?1?2?3?4]
???len?=?5,cap?=?12,slice?=?[0?1?2?3?4]