golang之array

golang使用array表示固定大小的数组，使用slice表示动态数组。

package main

import "fmt"

func main() {
	var a = [5]int{2,3,5,7,11}
	fmt.Printf("type of array: %T
", a)
	fmt.Printf("address of array: %p
", &a)
	fmt.Printf("address of arrar[0]: %p
", &a[0])

	s := a[:]
	fmt.Printf("slice = %v, len = %d, cap = %d
", s, len(s), cap(s))
	fmt.Printf("address of slice: %p
", &s)
	fmt.Printf("address of slice[0]: %p
", &s[0])

	s = append(s, 13)
	fmt.Printf("slice = %v, len = %d, cap = %d
", s, len(s), cap(s))
	fmt.Printf("address of slice: %p
", &s)
	fmt.Printf("address of slice[0]: %p
", &s[0])
}　　

输出如下:

type of array: [5]int
address of array: 0xc420014150
address of arrar[0]: 0xc420014150
slice = [2 3 5 7 11], len = 5, cap = 5
address of slice: 0xc42000a060
address of slice[0]: 0xc420014150
slice = [2 3 5 7 11 13], len = 6, cap = 10
address of slice: 0xc42000a060
address of slice[0]: 0xc42001c0f0

参考资料:

Slices: usage and internals 

https://golang.org/pkg/builtin/#append