Lesson Description
Lession - #370 Go-Error Handling
Go - Error Handling
Go programming gives a straightforward mistake taking care of system with inbuilt blunder interface kind of the accompanying announcement −
Syntax:
type error interface {
Error(>
string
}
Functions regularly return mistake as last bring esteem back. Use errors.New to develop a fundamental blunder 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
