53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
|
---
|
|||
|
|
title: Loops
|
|||
|
|
localeTitle: 循环
|
|||
|
|
---
|
|||
|
|
# 对于Go中的循环
|
|||
|
|
|
|||
|
|
Go只`for`循环。基本`for`循环有三个组件分隔`;` -
|
|||
|
|
|
|||
|
|
* **init**语句：在第一次迭代之前执行
|
|||
|
|
|
|||
|
|
* **条件**表达式：在每次迭代之前计算
|
|||
|
|
|
|||
|
|
* **post**语句：在每次迭代结束时执行
|
|||
|
|
|
|||
|
|
|
|||
|
|
**init**语句通常是一个简短的变量声明。在那里声明的变量只在`for`语句的范围内可见。一旦布尔条件求值为false，循环就会停止迭代。
|
|||
|
|
|
|||
|
|
`for`循环的一个例子如下 -
|
|||
|
|
|
|||
|
|
**放弃**
|
|||
|
|
|
|||
|
|
```go
|
|||
|
|
package main
|
|||
|
|
|
|||
|
|
import "fmt"
|
|||
|
|
|
|||
|
|
func main() {
|
|||
|
|
sum := 0
|
|||
|
|
for i := 0; i <= 10; i++ {
|
|||
|
|
sum += i
|
|||
|
|
}
|
|||
|
|
fmt.Println("The sum of first 10 natural numbers is", sum)
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
运行上述程序会产生类似于以下输出的输出 - \`\`\`
|
|||
|
|
$ go run for.go 前10个自然数之和为55
|
|||
|
|
```
|
|||
|
|
You can use `continue` and `break` to adjust the loops flow
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
走 //此代码打印最多5个奇数 对于n：= 0; n <= 10; n ++ { 如果n％2 == 0 { //如果数字甚至跳到下一个n 继续 } fmt.Println（n）的 //如果数字是5，则退出循环 如果n == 5 { 打破 } }
|
|||
|
|
```
|
|||
|
|
If you want to create an infinite loop just use `for { }`
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
走 for { // Whill循环直到条件破坏循环 break //退出循环 }
|
|||
|
|
```
|
|||
|
|
## Replacement for while-loop
|
|||
|
|
To simulate while-loop of other languages, you can simply exclude the **init** and **post** statement:
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
走 func main（）{ num：= 1 for num <= 1000 { num \* = 2 } fmt.Println（“1000以上2的最小功率”，num） } \`\`\`
|