The illustration shows a code segment with the lines numbered from 1 through 41 and the annotations are as follows:

//Program to demonstrate a very simple example of a class.
//A better version of the class DayOfYear will be given in
"#include <iostream>
using namespace std;
class DayOfYear
{
public:
void output( ); 
int month;
int day;
 };” with the block within “class DayOfYear” annotated as "Member function declaration."
“int main( )
{
DayOfYear today, birthday;
cout << "Enter today's date:\n";
cout << "Enter month as a number: ";
cin >> today.month;
cout << "Enter the day of the month: ";
cin >> today.day;
cout << "Enter your birthday:\n";
cout << "Enter month as a number: ";
cin >> birthday.month;
cout << "Enter the day of the month: ";
cin >> birthday.day;
cout << "Today's date is ";
today.output( );
cout << "Your birthday is ";
birthday.output( );” annotated as “Calls to the member function output” along with “today.output( );”
“if (today.month == birthday.month
&& today.day == birthday.day)
cout << "Happy Birthday!\n";
else
cout << "Happy Unbirthday!\n";
return 0;
}"
"//Uses iostream:
void DayOfYear::output( )
{
cout << "month = " << month
<< ", day = " << day << endl;
 }" with the block under the comment “Uses iostream:” annotated as "Memeber function definition.”