Golang Learning: Read and Write files (object-oriented version)

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package main import  ("FMT" "Bufio" "IO" "OS" "Flag" "StrConv")//  define a struct body type readwrite  struct {In *stringOut *string}//  Define initialization Method func  (Rw *readwrite)  init ()  {RW. In = flag. String ("In",  ' in ',  "in") RW. Out = flag. String ("Out",  ' out ',  "out") flag. Parse ()}//  defines a method for reading a file func  (rw *readwrite)  read ()   (result []int, err  Error)  {file, err1 := os. Open (* (rw. IN) if nil != err1 {panic ("Error to open file ...")}defer file. Close () Br := bufio. Newreader (file) result = make ([]int, 0) for {line, isprefix, err2 := br. ReadLine () If nil != err2 {if io. Eof == err2 {fmt. Println ("FINISH READ  ...")}break}if isprefix {return}str := string (line) value,  err3 := strconv. Atoi (str) if nil ! = err3 {err = err3return}result = append (Result, value)}return}//  Defines methods for writing files func  (rw *readwrite)  write (value []int)  {file, err := os. Create (* (rw. Out)) if nil != err {panic ("Error to create file ...")}defer file. Close () For index, res := range value {str := strconv. Itoa (res*index) file. WriteString (str +  "\ n")}}func main ()  {defer func ()  {if ex:=recover (); ex!= Nil {fmt. Println (Ex)}} () Rw := new (ReadWrite) rw. Init () value, err := rw. Read () if nil != err {panic ("Error ...")}rw. Write (Value)}