go 語言遍歷的幾種用法

package main
import "fmt"

func main(){
   for i:=0;i<20;i++{
      fmt.Println("遍歷結果：%d",i)
   }
 test1()
 test2()

}

func test1() {

    sum:=1
    for ; sum < 20; {

        sum+=sum
        fmt.Println("測試1==== %d",sum)
    }

}
func test2() {


    sum:=0
    for sum<20{
        //sum+=sum
 

        sum++
        fmt.Println("測試2==%d",sum)
    }

}