for initialisation; condition; post{
    //Do Something
}

func ForTest1(){
   for i:=1;i<=10;i++{
      fmt.Printf("i=%d\t",i)
   }
   fmt.Println()
}

func ForTest2(){
   i:=1
   for  ;i<=10; {
      i=i+2
      fmt.Printf("i=%d\t",i)
   }
   fmt.Println()
 
   //等價于
   for i<=10 {
      i=i+2
      fmt.Printf("i=%d\t",i)
      fmt.Println()
   }
}

func ForTest3(){
   for x,y:=1,10; x<10 && y>1; x,y = x+1,y-1{
      fmt.Printf("x=%d\t",x)
      fmt.Printf("y=%d\t",y)
      fmt.Println()
   }
   fmt.Println()
}

func ForTest4(){
   count:=1
   for {
      fmt.Printf("Hello\t")
      if(count == 3){
         break
      }
      count++
   }
}