[Yugong series] go teaching course in July 2022, an array of 020 go containers

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One 、Go Array of containers

1. What is an array

Array （Array） Is an ordered sequence of elements . If you name a limited set of variables of the same type , So the name is array name . The variables that make up an array are called the components of the array , Also known as an array of elements , Sometimes called subscript variable . The number used to distinguish the elements of an array is called the subscript . Arrays are in programming , For convenience , A form in which elements of the same type are organized in an orderly manner . These ordered sets of data elements of the same kind are called arrays .– Baidu Encyclopedia

An array is a continuous area of memory of a fixed length .

2.Go Array in language

stay Go Once the language array is declared , The size of the array is determined , You can't change the size, but you can change the array members .

Go The format of language defined array is as follows :

var  Array variable name  [ Element quantity ]T

explain ：

• Array variable name ： Define the variable name of an array
• Element quantity ： Define the size of the array
• T Can be any basic type , It can even be the array itself , If it's an array , You can implement multidimensional arrays

Related cases ：

package main

import (
	"fmt"
)

func main()  {
    
	//  Define a variable as  arr,  The member type is  string,  The size is  3  Array of 
	var arr [3]string

	//  Assignment operation 
	arr[0] = " Foolish Old Man 1 Number "
	arr[1] = " Foolish Old Man 2 Number "
	arr[2] = " Foolish Old Man 3 Number "

	fmt.Println(arr)
}

3. Initialize array

package main

import (
	"fmt"
)

func main() {
    
	//  Define a variable as  arr,  The member type is  string,  The size is  3  Array of 
	var arr = [3]string{
    " Foolish Old Man 1 Number ", "q Foolish Old Man 2 Number ", " Foolish Old Man 3 Number "}
	fmt.Println(arr)
}

4. Traversal of array

package main

import (
"fmt"
)

func main()  {
    
	//  Define a variable as  arr,  The member type is  string,  The size is  3  Array of 
	var arr = [...]string{
    " Foolish Old Man 1 Number ", "q Foolish Old Man 2 Number ", " Foolish Old Man 3 Number "}

	for index, v := range arr {
    
		fmt.Printf("index: %d, value: %s\n", index, v)
	}
}