// 简单If例子 a := 1 if a == 1 { fmt.Println("a = 1") } else if a == 2{ fmt.Println("a = 2") }else{ fmt.Println("a = others ")
  }
// 读取文件 const filename = "abc1.txt" if contents, err := ioutil.ReadFile(filename); err != nil{ fmt.Println(err) }else{ fmt.Printf("%s\n", contents) }

 var op = "+" switch op { case "+": fmt.Println("+") case "-": fmt.Printf("-") default: panic("unsupported operator:"+ op) }

 sum := 0 for i:=1 ; i<100; i++ { sum+= i } fmt.Println(sum)

func convertToBin(n int)  string{ result := "" for ; n>0 ; n/=2  { lsb := n%2 //strconv.Itoa(lsb) 转换字符串 result = strconv.Itoa(lsb) + result } return result
}

func main()  { fmt.Println( convertToBin(5), convertToBin(13), )
}

//读文件，省略开始和递增条件
func printFile(filename string)  { file, err := os.Open(filename) if err != nil{ panic(err) } scanner := bufio.NewScanner(file) for scanner.Scan() { fmt.Println(scanner.Text()) }
}
//死循环
func forver()  { for  { fmt.Println("abc") }
}

func main()  { printFile("abc.txt") forver()
}