fix C++ example

examples/add_person.cc

@@ -32,7 +32,7 @@ void PromptForAddress(tutorial::Person* person) {
       break;
     }
 
-    tutorial::Person::PhoneNumber* phone_number = person->add_phone();
+    tutorial::Person::PhoneNumber* phone_number = person->add_phones();
     phone_number->set_number(number);
 
     cout << "Is this a mobile, home, or work phone? ";
@@ -77,7 +77,7 @@ int main(int argc, char* argv[]) {
   }
 
   // Add an address.
-  PromptForAddress(address_book.add_person());
+  PromptForAddress(address_book.add_persons());
 
   {
     // Write the new address book back to disk.

examples/list_people.cc

@@ -8,17 +8,17 @@ using namespace std;
 
 // Iterates though all people in the AddressBook and prints info about them.
 void ListPeople(const tutorial::AddressBook& address_book) {
-  for (int i = 0; i < address_book.person_size(); i++) {
+  for (int i = 0; i < address_book.persons_size(); i++) {
-    const tutorial::Person& person = address_book.person(i);
+    const tutorial::Person& person = address_book.persons(i);
 
     cout << "Person ID: " << person.id() << endl;
     cout << "  Name: " << person.name() << endl;
-    if (person.has_email()) {
+    if (person.email() != "") {
       cout << "  E-mail address: " << person.email() << endl;
     }
 
-    for (int j = 0; j < person.phone_size(); j++) {
+    for (int j = 0; j < person.phones_size(); j++) {
-      const tutorial::Person::PhoneNumber& phone_number = person.phone(j);
+      const tutorial::Person::PhoneNumber& phone_number = person.phones(j);
 
       switch (phone_number.type()) {
         case tutorial::Person::MOBILE: