Self study the definition of golang [3.5go language array, range keyword] array, and use the for loop to traverse one-dimensional array

Catalog

1. Define an integer array , The quantity is written before the type

2. Let the compiler count without defining the size

3. Define a 4 That's ok 5 Column array and output

4. use for Loop through a one-dimensional array

5. Use range Traversal array

6. use range Keyword output subscript and its corresponding value

summary

Code summary of this chapter ：

Output ：

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1. Define an integer array , The quantity is written before the type

var arr1 [5]int // Define an integer array , The quantity is written before the type 

2. Let the compiler count without defining the size

arr3 := [...]int{2, 4, 6, 8, 10} // Let the compiler count without defining the size 

3. Define a 4 That's ok 5 Column array and output

var grid [4][5]int // Define a 4 That's ok 5 Column array and output 
	fmt.Println(grid)

4. use for Loop through a one-dimensional array

// Traversal array 
	for i := 0; i < len(arr3); i++ { // use for Loop through a one-dimensional array 
		fmt.Println(arr3[i])
	}

5. Use range Traversal array

	for i := range arr3 { // use range Keyword traverse one-dimensional array , Same as the previous line 
		fmt.Println(arr3[i])
	}

6. use range Keyword output subscript and its corresponding value

for i, v := range arr3 { // use range Keyword output subscript and its corresponding value 
		fmt.Println(i, v)
	}

summary

Code summary of this chapter ：

package main

import "fmt"

func main() {
	var arr1 [5]int // Define an integer array , The quantity is written before the type 
	arr2 := [3]int{1, 3, 5}
	arr3 := [...]int{2, 4, 6, 8, 10} // Let the compiler count without defining the size 
	fmt.Println(arr1, arr2, arr3)
	var grid [4][5]int // Define a 4 That's ok 5 Column array and output 
	fmt.Println(grid)
	// Traversal array 
	for i := 0; i < len(arr3); i++ { // use for Loop through a one-dimensional array 
		fmt.Println(arr3[i])
	}
	for i := range arr3 { // use range Keyword traverse one-dimensional array , Same as the previous line 
		fmt.Println(arr3[i])
	}
	for i, v := range arr3 { // use range Keyword output subscript and its corresponding value 
		fmt.Println(i, v)
	}
}

Output ：

[0 0 0 0 0] [1 3 5] [2 4 6 8 10]
[[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]]
2                                                
4                                                
6                                                
8                                                
10                                               
2                                                
4                                                
6                                                
8                                                
10                                               
0 2                                              
1 4                                              
2 6                                              
3 8                                              
4 10             

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