update book code

eBook/examples/chapter_10/structs_fields.go

@@ -0,0 +1,23 @@
+package main
+
+import "fmt"
+
+type struct1 struct {
+	i1   int
+	f1   float32
+	str  string
+}
+
+func main() {
+	// var ms *struct1 = new(struct1)
+	// better:
+	ms := new(struct1)
+	ms.i1 = 10
+	ms.f1 = 15.5
+	ms.str = "Chris"
+	// ms := &struct1{10, 15.5, "Chris"}
+	fmt.Printf("The int is: %d\n", ms.i1)
+	fmt.Printf("The float is: %f\n", ms.f1)
+	fmt.Printf("The string is: %s\n", ms.str)
+	fmt.Println(ms) // output: &{10 15.5 Chris}
+}