fix: coding style and file format for all example.

eBook/examples/chapter_12/json.go

@@ -1,40 +1,40 @@
-// json.go
-package main
-
-import (
-	"fmt"
-	"encoding/json"
-	"log"
-	"os"
-)
-
-type Address struct {
-	Type             string
-	City             string
-	Country          string
-}
-
-type VCard struct {
-	FirstName	string
-	LastName	string
-	Addresses	[]*Address
-	Remark		string
-}
-
-func main() {
-	pa := &Address{"private", "Aartselaar","Belgium"}
-	wa := &Address{"work", "Boom", "Belgium"}
-	vc := VCard{"Jan", "Kersschot", []*Address{pa,wa}, "none"}
-	// fmt.Printf("%v: \n", vc) // {Jan Kersschot [0x126d2b80 0x126d2be0] none}: 
-	// JSON format:
-	js, _ := json.Marshal(vc)
-	fmt.Printf("JSON format: %s", js)
-	// using an encoder:
-	file, _ := os.OpenFile("vcard.json", os.O_CREATE|os.O_WRONLY, 0)
-	defer file.Close()
-	enc := json.NewEncoder(file)
-	err := enc.Encode(vc)
-	if err != nil {
-		log.Println("Error in encoding json")
-	}
-}
+// json.go
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+)
+
+type Address struct {
+	Type    string
+	City    string
+	Country string
+}
+
+type VCard struct {
+	FirstName string
+	LastName  string
+	Addresses []*Address
+	Remark    string
+}
+
+func main() {
+	pa := &Address{"private", "Aartselaar", "Belgium"}
+	wa := &Address{"work", "Boom", "Belgium"}
+	vc := VCard{"Jan", "Kersschot", []*Address{pa, wa}, "none"}
+	// fmt.Printf("%v: \n", vc) // {Jan Kersschot [0x126d2b80 0x126d2be0] none}:
+	// JSON format:
+	js, _ := json.Marshal(vc)
+	fmt.Printf("JSON format: %s", js)
+	// using an encoder:
+	file, _ := os.OpenFile("vcard.json", os.O_CREATE|os.O_WRONLY, 0)
+	defer file.Close()
+	enc := json.NewEncoder(file)
+	err := enc.Encode(vc)
+	if err != nil {
+		log.Println("Error in encoding json")
+	}
+}