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Go programming 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 as following −
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)
}
Example
package main
import "errors"
import "fmt"
import "math"
func Sqrt(value float64)(float64, error) {
if(value < 0){
return 0, errors.New("Math: negative number passed to Sqrt")
}
return math.Sqrt(value), nil
}
func main() {
result, err:= Sqrt(-1)
if err != nil {
fmt.Println(err)
} else {
fmt.Println(result)
}
result, err = Sqrt(9)
if err != nil {
fmt.Println(err)
} else {
fmt.Println(result)
}
}
When the above code is compiled and executed, it produces the following result −
Math: negative number passed to Sqrt 3
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