update book code

eBook/examples/chapter_11/reflect_struct2.go

@@ -0,0 +1,31 @@
+// reflect_struct2.go
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+type T struct {
+	A int
+	B string
+}
+
+func main() {
+	t := T{23, "skidoo"}
+	s := reflect.ValueOf(&t).Elem()
+	typeOfT := s.Type()
+	for i := 0; i < s.NumField(); i++ {
+		f := s.Field(i)
+		fmt.Printf("%d: %s %s = %v\n", i,
+			typeOfT.Field(i).Name, f.Type(), f.Interface())
+	}
+	s.Field(0).SetInt(77)
+	s.Field(1).SetString("Sunset Strip")
+	fmt.Println("t is now", t)
+}
+/* Output:
+0: A int = 23
+1: B string = skidoo
+t is now {77 Sunset Strip}
+*/