error handling in Go

Go provides a pretty simple error handling framework with inbuilt error interface type of the following declaration,
```
type error interface {
   Error() string
}
```
Functions normally return error as last return value. Use errors.New to construct a basic error message.
```
func Sqrt(value float64)(float64, error) {
   if(value < 0){
      return 0, errors.New("Math: negative number passed to Sqrt")
   }
   return math.Sqrt(value), nil
}
```
Use return value and error message.
```
result, err:= Sqrt(-1)
if err != nil {
   fmt.Println(err)
}
```
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