error.go

package main

import (
	"errors"
	"fmt"
	"strconv"
	"strings"
)

func main(){
  var input string
	fmt.Println("Enter some number: ")
	fmt.Scanln(&input)

	var number int
	var err error
	number, err = strconv.Atoi(input)

	if err == nil {
		fmt.Println(number, " is number")
	} else {
		fmt.Println(input, " is not number")
		fmt.Println(err.Error())
  }
}

// jika hasilnya error 
//Enter some number: 
//k
// k  is not number
// strconv.Atoi: parsing "k": invalid syntax

// jika benar
// Enter some number: 
// 1
// 1  is number