package main
import (
"fmt"
)
func main() {
var arr1 []int = []int{, , } //定义并初始化长度为3的数组
fmt.Println(arr1) //[1 2 3]
arr2 := [...] int {:-} //长度为20的数组，只有最后一个是-1，其他都是0
fmt.Println(arr2) //[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1]
arr3 := []int{, , } //定义并初始化长度为3的数组
fmt.Println(arr3) //[5 6 7]
arr4 := [...]int{:, :, :} //指定下标的数组，一共四个，因为最大是3
fmt.Println(arr4) //[200 100 0 50]
var arr5 []int //3个int型的数组，初始值是3个0,数组“零值”状态
fmt.Println(arr5) //[0 0 0]
//二维数组
arr6 := [][]int{{,,,},{,,},{,,}}
//打印一维数组长度
fmt.Println(len(arr6)) //3
//打印二维数组长度
fmt.Println(len(arr6[])) //4
//打印整个二维数组
fmt.Println(arr6) //[[0 1 2 3] [6 7 9 0] [6 4 5 0]]
arr7 := [...]string{:"zhangsan", :"lisi", :"wangwu"}
fmt.Printf("%q",arr7) //["" "zhangsan" "" "wangwu" "" "" "lisi"]
}
package main
import "fmt"
func main() {
var a = new([]int)
test(a)
fmt.Println(a, len(a))
}
func test(a *[]int) {
a[] =
}
///&[0 5 0 0 0] 5
package main
import "fmt"
func main() {
a := [...]User{
{, "User0"},
{, "User8"},
}
b := [...]*User{
{, "User0"},
{, "User8"},
}
fmt.Println(a, len(a))
fmt.Println(b, len(b))
}
type User struct {
Id int
Name string
}
//结果
//[{0 User0} {8 User8}] 2
//[0xc042002440 0xc042002460] 2
//for range遍历
package main
import (
"fmt"
)
func main() {
arr := [...]string{"golang", "php", "java", "python"}
for key, val := range arr {
//for _, val := range arr { //如果不想利用key，可以用占位符
fmt.Printf("key=%v, val=%v\n", key, val)
}
// key=0, val=golang
// key=1, val=php
// key=2, val=java
// key=3, val=python
}