About Vectors....

[jimas13]

So i have this code for an exercise about a Delivery company that delivers packages. Each package has its different characteristics and its separated in 3 categories, the basic, the advanced, and the overnight.

The question is how can i access the member functions, like calculateDate, of any class when the object is created in the vector. I have beed trying using an iterator but it comes up with an error...

#include <cstdlib>
#include <vector>
#include <iostream>
#include <ctime>
#include <string>
#define a 5
#define f 2
#define b 10
using namespace std;

class Date
{
private:
    int day, month, year;
public:
    Date();
    void display_date ();
    Date operator+ (int x);
};

class Package
{
protected:
    float weight;
    string namesend;
    string namerec;
    string addrec;
    Date date;
public:
    Package();
    virtual float calculateCost();
    virtual void calculateDate ();
    virtual void displayPackage ();
    void set_weight (float wei);
    float get_weight();
    void set_namesend (string name);
    string get_namesend ();
    void set_namerec (string rec);
    string get_namerec ();
    void set_addrec (string addrec);
    string get_addrec ();
};

class Advanced_Package:public Package
{
public:
    Advanced_Package();
    float calculateCost();
    void calculateDate();
    void displayPackage ();
};

class Overnight_Package:public Package
{
public:
    Overnight_Package();
    float calculateCost();
    void calculateDate();
    void displayPackage ();
};
Date::Date()
{
    time_t rawtime;
    struct tm* timeinfo;
    time(&rawtime);
    timeinfo=localtime(&rawtime);
    day=timeinfo->tm_mday;
    month=timeinfo->tm_mon + 1;
    year=timeinfo->tm_year + 1900;
}

void Date::display_date()
{
    cout << day << "/" << month << "/" << year << endl;
}

Date Date::operator +(int x)
{    
    Date temp;
    temp.day=temp.day+x;
    if(temp.month%2==0)
    {
        if(temp.day>31)
        {
            temp.day=temp.day-31;
            temp.month++;
            if(temp.month>12)
            {
                temp.year++;
                temp.month=temp.month-12;
            }
        }
    }
    else
    {
        if(temp.day>30)
        {
            temp.day=temp.day-30;
            temp.month++;
            if(temp.month>12)
            {
                temp.year++;
                temp.month=temp.month-12;
            }
        }
    }
    return temp;
}

Package::Package()
{
    weight=0;
    namesend="unknown";
    namerec="unknown";
    addrec="unknown";
}
void Package::set_weight (float wei)
{
    weight=wei;
}
float Package::get_weight()
{
    return weight;
}
void Package::set_namesend (string name)
{
    namesend=name;
}
string Package::get_namesend ()
{
    return namesend;
}
void Package::set_namerec (string rec)
{
    namerec=rec;
}
string Package::get_namerec ()
{
    return namerec;
}
void Package::set_addrec (string adrec)
{
    addrec=adrec;
}
string Package::get_addrec ()
{
    return addrec;
}
void Package::calculateDate()
{
    date=date+5;
}
void Package::displayPackage()
{
    cout << weight << "  " << namesend << "  " << namerec << "  " << addrec << "\nyou have picked Basic package delivery"<< endl;
    cout << "ETOD: ";
    date.display_date();
    cout << endl;
}

float Package::calculateCost()
{
    return a*(weight);
}
Advanced_Package::Advanced_Package()
{
    weight=0;
    namesend="unknown";
    namerec="unknown";
    addrec="unknown";
}
float Advanced_Package::calculateCost()
{
    return f+a*(weight);
}
void Advanced_Package::calculateDate()
{
    date=date+2;
}
void Advanced_Package::displayPackage()
{
    cout << weight << "  " << namesend << "  " << namerec << "  " << addrec << "\nyou have picked Advanced package delivery"<< endl;
    cout << "ETOD: ";
    date.display_date();
    cout << endl;
}
Overnight_Package::Overnight_Package()
{
    weight=0;
    namesend="unknown";
    namerec="unknown";
    addrec="unknown";
}
float Overnight_Package::calculateCost()
{
    return (b+a)*(weight);
}
void Overnight_Package::calculateDate()
{
    date=date+1;
}
void Overnight_Package::displayPackage()
{
    cout << weight << "  " << namesend << "  " << namerec << "  " << addrec << "\nyou have picked Overnight package delivery"<< endl;
    cout << "ETOD: ";
    date.display_date();
    cout << endl;
}

i have been trying using this, but the program ends when it gets to the line after the creation of the object

vector<Package*> packages;
    string str;
    float num;
    int option;
    vector<Package*>::iterator it=packages.begin();
    vector<Package*>::iterator at;
    do{
    cout << "-----------Menu-----------------------" << endl;
    cout << "|Type 1 to send a Basic package      |" << endl;
    cout << "|Type 2 to send an Advanced package  |" << endl;
    cout << "|Type 3 to send an Overnight package |" << endl;
    cout << "|Type 4 to view all pending packages |" << endl;
    cout << "|Type 0 to exit                      |" << endl;
    cout << "--------------------------------------" << endl;
    cin >> option;
    cin.ignore();
    
    if(option==1)
    {
        packages.push_back(new Package());
        (*it)->calculateDate();
        cout << "insert your name" << endl;
        getline(cin, str);
        (*it)->set_namesend(str);
        cout << "insert receivers name" << endl;
        getline(cin, str);
        (*it)->set_namerec(str);
        cout << "insert receiver's address" << endl;
        getline(cin, str);
        (*it)->set_addrec(str);
        cout << "insert the weight of the package" << endl;
        cin >> num;
        cin.ignore();
        (*it)->set_weight(num);
        ++it;
    }
    else if(option==2)
    {
        packages.push_back(new Advanced_Package());        
        (*it)->calculateDate();
        cout << "insert your name" << endl;
        getline(cin, str);
        (*it)->set_namesend(str);
        cout << "insert receivers name" << endl;
        getline(cin, str);
        (*it)->set_namerec(str);
        cout << "insert receiver's address" << endl;
        getline(cin, str);
        (*it)->set_addrec(str);
        cout << "insert the weight of the package" << endl;
        cin >> num;
        cin.ignore();
        (*it)->set_weight(num);
        ++it;
    }
    else if(option==3)
    {
        packages.push_back(new Overnight_Package());
        (*it)->calculateDate();
        cout << "insert your name" << endl;
        getline(cin, str);
        (*it)->set_namesend(str);
        cout << "insert receivers name" << endl;
        getline(cin, str);
        (*it)->set_namerec(str);
        cout << "insert receiver's address" << endl;
        getline(cin, str);
        (*it)->set_addrec(str);
        cout << "insert the weight of the package" << endl;
        cin >> num;
        cin.ignore();
        (*it)->set_weight(num);
        ++it;
    }
    else if(option==4)
    {
        for(at = packages.begin(); at!=packages.end(); ++at)
    {
        (*at)->displayPackage();
    }
    }
    }
    while(option!=0);

[jimas13]

ohh nevermind i figured it out...
i had been initializing the iterator, before the vector had any objects, instead of initializing it inside every <if>

any other suggestions are welcome :D