An article analyzing loop statements that can be implemented in golang

Go language is an object-oriented, statically typed programming language developed and promoted by Google, which has the characteristics of memory safety and concurrency support. In the Go language, a loop is the basic construct for repeatedly executing a set of statements. In this article, we will introduce how to use loops to implement common tasks in Go language.

1. for loop

The for loop in Go language is similar to the for loop in C language. It consists of keyword for, conditional statement and loop body. The syntax format of a for loop is as follows:

for 初始化语句; 条件语句; 后置语句 {
    循环体语句
}

Among them, the initialization statement is executed once before entering the loop, and the conditional statement is executed at the beginning of each loop. If the conditional judgment fails, the loop is exited, and the post-position statement is executed every time. Executed at the end of the loop. The following is a simple for loop example, used to calculate the sum of 1 to 10:

sum:=0
for i:=1;i<=10;i++{
   sum+=i
}
fmt.Println(sum)

2. While loop

There is no while keyword in the Go language, but it can be implemented using a for loop Function similar to while loop. Among them, the initialization statement and post-statement can be omitted, and only the conditional statement is retained. The following is an example of a while loop, used to print odd numbers between 1 and 10:

i:=1
for i<=10{
  if i%2==1{
     fmt.Println(i)
  }
  i++
}

3. Do-while loop

There is no do-while loop in the Go language, but it can be used for loops and break statements to implement functions similar to do-while loops. The following is an example of a do-while loop, used to input positive integers until 0 is input:

var input int
for {
  fmt.Scan(&input)
  if input==0{
     break
  }
}

4. Range loop

The range keyword in the Go language is used to iterate arrays and slices and mapping data structures. The syntax format of the range loop is as follows:

for index, value := range array/slice/map {
   循环体语句
}

Among them, index is the subscript of the array or slice element or the mapped key, and value is the value of the element or the mapped value. The following is an example of a range loop that traverses a slice and multiplies all elements by 2:

slice:=[]int{1,2,3,4}
for index,value:=range slice{
    slice[index]=value*2
}
fmt.Println(slice)

Through the above introduction, I believe you have understood how to use loops to implement common tasks in the Go language. In the actual development process, we should choose an appropriate loop structure according to specific needs, and pay attention to avoiding problems such as infinite loops.

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