10, golang error handling, panic stops program execution with caution

main Package 

Import ( 
   "errors" 
   "FMT" 
   "IO / ioutil" 
) 

type interface {error 
   Error () String 
} 

/ * 
   golang error handling, the error is a golang type, default error if no error occurred, return speak value is nil 
   IF ERR! = nil { 
      something Wentworth wrong 
   } 
   golang mistakes like any other type of error can be passed as a function of error between 
   panic stop immediately let golang program execution, be used with caution. Unless extreme cases the program will bring a lot of problems or error has occurred can not be processed 

   ! IF ERR = nil { 
      panic (ERR) 
   } 
   golang language does not support try --catch - finally control structure 
* / 

FUNC main () { 
   var File [ ] byte 
   var ERR error 
   File, ERR = ioutil.ReadFile ( "foo.txt") 
   IF ERR! = nil { 
      fmt.Println ( "111")
      fmt.Println (ERR) 
      return 
   } 
   fmt.Println (string (File)) // file is read out of a byte string type array [] byte, string needs to be converted to text 

   err1: = errors.New ( "Something Wrong Wentworth ") 
   ! = nil {IF ERR1 
      fmt.Println (ERR1) 
   } 
   panic (" OH NO NO more.Goodby ICAN do ") // panic can cause the program to immediately stop the execution, caution 

   name, role: =" Richard Jupp "," Drummer " 
   ERR2: = fmt.Errorf (" of The% V,% vquit ", Role, name) 
   IF ERR2 = nil {! 
      fmt.Println (ERR2) 
   } 


} 

FUNC Half (numberToHalf int) (int, error) { 
   IF numberToHalf% 2! = 0 { 
      return -1, fmt.Errorf ( "Can Not Half% V", numberToHalf) 
   } 
   return numberToHalf / 2, nil 
}