#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

struct Person {
  string name;
  int age;
};

const int MAX_PEOPLE = 10;

string getName();
void setAge(Person* f_person);
void print(Person* f_people);
void print(int oldest, double avg_age);
void calc (Person* f_people, int* f_oldest, double& f_avg_age);

int main() {

  //declare variables
  Person* people = new Person[MAX_PEOPLE];
  int oldest = 0;
  double avg_age = 0;

  //initialization
  for(int i = 0; i < MAX_PEOPLE; i++) {
    people[i].name = getName();
    setAge(&people[i]);
  }
  print(people);

  calc(people, &oldest, avg_age);

  print(oldest, avg_age);

  delete[] people;
  
  return EXIT_SUCCESS;
}


string getName() {
  string tmp_name;
  cout << "Enter name: ";
  cin >> tmp_name;
  return tmp_name;
}

void setAge(Person* f_person) {
  cout << "Enter age: ";
  cin >> f_person->age;
}

void print(Person* f_people) {
  int i = 0;
  while(i < MAX_PEOPLE) {
    cout << "Name of person number (" << (i+1) << "): " << f_people[i].name << endl;
    cout << "Age of person number (" << (i+1) << "): " << f_people[i].age << endl << endl;
    i++;
  }
}

void calc (Person* f_people, int* f_oldest, double& f_avg_age) {
  double avg_total = 0;
  for(int i = 0; i < MAX_PEOPLE; i++) {
    //test to see if current person older
    if(i == 0 || f_people[i].age > *f_oldest) {
      *f_oldest = f_people[i].age;
    }

    //add to average
    avg_total += f_people[i].age;
  }
  f_avg_age = avg_total/(double)MAX_PEOPLE;
}

void print(int oldest, double avg_age) {
  cout << "The oldest person is: " << oldest << "." << endl;
  cout << "The average age is: " << avg_age <<  "." << endl;
}