update book code

eBook/exercises/chapter_10/personex1.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Person struct {
+	firstName	string
+	lastName	string
+}
+
+func upPerson (p Person) {
+	p.firstName = strings.ToUpper(p.firstName)
+	p.lastName = strings.ToUpper(p.lastName)
+}
+
+func main() {
+// 1- struct as a value type:
+	var pers1 Person
+	pers1.firstName = "Chris"
+	pers1.lastName = "Woodward"
+	upPerson(pers1)
+	fmt.Printf("The name of the person is %s %s\n", pers1.firstName, pers1.lastName)
+// 2 - struct as a pointer:
+	pers2 := new(Person)
+	pers2.firstName = "Chris"
+	pers2.lastName = "Woodward"
+	upPerson(*pers2)
+	fmt.Printf("The name of the person is %s %s\n", pers2.firstName, pers2.lastName)
+// 3 - struct as a literal:
+	pers3 := &Person{"Chris","Woodward"}
+	upPerson(*pers3)
+	fmt.Printf("The name of the person is %s %s\n", pers3.firstName, pers3.lastName)
+}	
+/* Output:
+The name of the person is Chris Woodward
+The name of the person is Chris Woodward
+The name of the person is Chris Woodward
+*/