Mostrar la media de edades de personas y los que están por sobre ella. Información desde archivo binario.

colas.cpp

/*
  Copyright (C) 2015  Katerine Muñoz Tello <[email protected]>

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

*** Nombre: Katerine Muñoz Tello.
*** Objetivo:  Genere un objeto cola que contenga datos de personas, 
    entre ellos la edad, luego muestre la media de la edad y quienes están sobre ella.  
    Recuerde extraer la información de un archivo binario.
*** SO: Fedora 23.
*** IDE: Sublime text.
*** Compilador: GNU Make 4.0
*/


#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;

struct people{
  char name[30];
  int age;
  people *next;
};

class Pe{
  people *first;
  people *last;
public:
  Pe();
  ~Pe();
  void in(char na[30], int n);
  void out();
  void show();
  void showolder();
  float average();
};

Pe::Pe(){
  first = last = NULL;
}

Pe::~Pe(){
  people *aux;
  
  while(first){
    aux = first;
    first = first->next;
    delete aux;
  }
}

void Pe::in(char na[30], int n){
  people *aux;
  aux = new people;
  strncpy(aux->name, na, 30);
  aux->age = n;
  aux->next = NULL;

  if(!first){
    first = aux;
    last = aux;
  }
  else{
    last -> next = aux;
    last = aux;
  }
}

void Pe::out(){                   
  people *aux;
  
  if(first){
    aux = first;
    first = first->next;
    delete aux;
  }
  else{
    cout << "Lista vacia" << endl;
  }
}

void Pe::show(){
  people *aux;
  aux = first;

  while(aux){
    cout << aux->name <<" tiene "<< aux->age <<" años. "<< endl;
    aux = aux->next;
  }
}

float Pe::average(){     //Busca la media de las edades.
  people *auxf;
  auxf = first;
  float average = 0;
  int cont = 0;

  while(auxf){
    average += auxf->age;
    cont++;
    auxf = auxf->next;
  }
  average /= cont;

  return average;
}

void Pe::showolder(){  //Muestra a los que están por sobre la media.
  people *auxf;
  auxf = first;
  float av = average();

  cout << "La media de la edad es " << av << " y los que estan por sobre ella son: " << endl;

  while(auxf){
    if(auxf->age > av){
      cout << (auxf->name) << endl;
    }
    auxf = auxf->next;
  }
}

int main(){
  people p;
  Pe c;
  ifstream f1;

  f1.open("colas.txt", ios::binary);
  f1.read((char *)(&p),sizeof(people));

  while(!f1.eof()){         //Ingresa los datos a la cola desde binario.
    c.in(p.name, p.age);
    f1.read((char *)(&p),sizeof(people));
  }

  f1.close();

  c.show();
  c.showolder();

  return 0;
}