Go language - loop statement

Go Circular statements of language

Go There is only one kind of circular statement in language , That's it for

1. for( sentence 1; sentence 2; sentence 3){
         
       /* ......*/
   }
   

sentence 1 Assign an expression to , It is generally used to set the initial value of the cycle control variable , sentence 2 For conditional control statements , sentence 3 Assign an expression to , It is generally used to set the loop control variable .

Examples of use :

for i:=1;i<=10;i++{
    
    println(i)
}
// Print 1~10

---

As shown above ,for The use of statements is basically the same as C/C++ Agreement . For the above for In the loop sentence 1 and sentence 3 It can be omitted . sentence 1 And statement 3 Mainly through the set cycle control variables to control the number of cycles , We can also use for Variables outside the statement block to control the loop , I.e. omitted sentence 1 and sentence 3, Only conditional control statements are left （ sentence 2）, At this time for The function of the statement is the same as C/C++ in while The functions of the statements are consistent .

2. for  Conditions {
         
       /* ..... */
   }
   

Examples of use :

i := 1
for i <= 10{
    
    println(i)
    i++
}
// Print 1~10

such for Circular writing format , Can replace while loop .

3. Infinite loop

for true{
    
    println("Hello go")
}

// It can also be written as follows , I.e. omitted true
for {
    
    println("Hello go")
}

---

for-each

By using for-each To realize the function of traversing an iteratable object . Be similar to python Medium for ... in....

Examples of use :

	var arr [3]string = [3]string{
    "go", "C", "python"}
	for _, value:= range arr{
    
		fmt.Println("Hello ", value)
	}

The output is :

Hello  go
Hello  C
Hello  python

explain ：range Two values will be returned , One is the index , The other is the value corresponding to the index . When indexes are not available , have access to _ Discard change value .

gossip

because for The loop statement itself can be implemented while The nature of the cycle ,go Language abandoned while sentence , Embodies the go The simplicity of language .

Reference material

• https://www.runoob.com/go/go-for-loop.html
• https://golang.iswbm.com/c01/c01_10.html