package main

import "fmt"

/**
定义切片
var slice1 []type = make([]type, len)
slice1 := make([]type, len)
指定容量,capacity
make([]T, length, capacity)
*/

func main() {
	s := []int{1, 2, 3, 4}
	s1 := make([]int, 2, 3)
	fmt.Println(s)
	fmt.Println(len(s1), cap(s1), s1)
	fmt.Println(len(s), cap(s), s)
	s2 := s[:3]
	fmt.Println(s2)


	var numbers []int
	printSlice(numbers)

	/* 允许追加空切片 */
	numbers = append(numbers, 0)
	printSlice(numbers)

	/* 向切片添加一个元素 */
	numbers = append(numbers, 1)
	printSlice(numbers)

	/* 同时添加多个元素 */
	numbers = append(numbers, 2,3,4)
	printSlice(numbers)

	/* 创建切片 numbers1 是之前切片的两倍容量*/
	numbers1 := make([]int, len(numbers), (cap(numbers))*2)

	/* 拷贝 numbers 的内容到 numbers1 */
	copy(numbers1,numbers)
	printSlice(numbers1)
}

func printSlice(x []int){
	fmt.Printf("len=%d cap=%d slice=%v\n",len(x),cap(x),x)
}