Go基础之For循环

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)
        }
    }
}