package main

import (
	"fmt"
)

func test() {
	var a [10]int
	a[0] = 10
	a[9] = 15
	for i := 0; i < len(a); i++ {
		fmt.Println(a[i])
	}
	for index, val := range a {
		fmt.Printf("a[%d]=%d\n", index, val)
	}
}
func test1() { //数组是值，一个数组的值不影响另一个数组
	var a [10]int
	b := a
	b[5] = 10
	fmt.Println(a)
	fmt.Println(b)
}
func test2(arr *[5]int) { //数组值通过指针来修改
	arr[0] = 100
}
func Fib(n int) {
	var a []int64
	a = make([]int64, n+1)
	a[0] = 1
	a[1] = 1
	for i := 2; i <= n; i++ {
		a[i] = a[i-1] + a[i-2]
	}
	for _, val := range a {
		fmt.Println(val)
	}
}
func test3() { //数组的初始化
	var age0 [5]int = [5]int{1, 2, 3, 4}
	var age1 = [5]int{6, 7, 8, 9, 10}
	var age2 = [...]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 110}
	var age3 = [...]int{1: 100, 3: 200}
	var str = [5]string{3: "hello world", 4: "tom"}
	fmt.Println(age0)
	fmt.Println(age1)
	fmt.Println(age2)
	fmt.Println(age3)
	for index, val := range str {
		fmt.Printf("str[%d]=%s\n", index, val)
	}

}
func test4(){//多维数组的初始化及使用
	var age [5][3]int
	var f =[...][3]int{{11,2,3},{22,3,4},{33,4,6},{44,8,9}}
	fmt.Println(age)
	for cow,val:=range f{
		for col,v:=range val{
			fmt.Printf("str[%d][%d]=%d ",cow,col,v)
			
		}
		fmt.Println()
	}
}
func main() {
	// test()
	// test1()

	// var a [5]int
	// test2(&a)
	// fmt.Println(a)

	// Fib(50)

	// test3()

	test4()
}