for

for典型用法

简单循环

无限循环

就近跳出循环

指定跳出

package main

import "fmt"

func main() {

fmt.Println("For_Simple:\n")

For_Simple()

fmt.Println("For_Ever:\n")

For_Ever()

fmt.Println("For_Break_One:\n")

For_Break_One()

fmt.Println("For_Break_Any:\n")

For_Break_Any()

}

func For_Simple() {

//标准For循环，注意表达式不带花括号

sum := 0

for i := 0; i < 10; i++ {

sum += i

}

fmt.Println("For_Simple:sum =", sum)

}

func For_Ever() {

//无限循环，后不跟表达式

sum := 0

for {

sum += 2

if sum > 100 {

break

}

}

fmt.Println("For_Ever:sum =", sum)

}

func For_Break_One() {

//break默认跳出本次循环，就近原则

for i := 0; i < 3; i++ {

for j := 0; j < 3; j++ {

if j == 2 {

break

}

fmt.Printf("i = %d,j = %d\n", i, j)

}

}

}

func For_Break_Any() {

//break后跟定义好的标志，可以指定跳跃

JumpTo:

for i := 0; i < 3; i++ {

for j := 0; j < 3; j++ {

if j == 2 {

break JumpTo

}

fmt.Printf("i = %d,j = %d\n", i, j)

}

}

}