c++ - 我的包编译，get 函数工作，除了它打印随机数的 double

Question

我的包可以编译，get 函数可以工作，除了打印随机数的 double 。有什么想法吗？

#ifndef Package_H
#define Package_H


#include <string>

using namespace std;

//The class Package is the base class for derived classes TwoDayPackage and OverNightPackage

class Package //begins class Package 
{ 
public: 
    Package(const string &, const string &, const string &, const string &, const string &, const string &, const string &, const string &, const string &, const string &, double = 0.0, double  = 0.0); //constructor 

    //set and get functions for sender 
    void setSenderName(const string &); 
    string getSenderName() const; 

    void setSenderAddress(const string &); 
    string getSenderAddress() const; 

    void setSenderCity(const string &); 
    string getSenderCity() const; 

    void setSenderState(const string &); 
    string getSenderState() const; 

    void setSenderZip(const string &); 
    string getSenderZip() const; 

    //set and get functions for recipient 
    void setRecipientName(const string &);   
    string getRecipientName() const;   

    void setRecipientAddress(const string &);   
    string getRecipientAddress() const;   

    void setRecipientCity(const string &);   
    string getRecipientCity() const;   

    void setRecipientState(const string &);   
    string getRecipientState() const; 

    void setRecipientZip(const string &);   
    string getRecipientZip() const; 

    void setWeight(double); 
    double getWeight() const; 

    void setShip(double); 
    double getShip() const; 

    double calculateCost() const; 
    void print() const;

private: 
    string senderName; 
    string senderAddress; 
    string senderCity; 
    string senderState; 
    string senderZip; 
    string recipientName; 
    string recipientAddress; 
    string recipientCity; 
    string recipientState; 
    string recipientZip; 
    double weight; 
    double shipCost; 

};

#endif

.

//next page
#include <iostream>
using namespace std;

#include "Package.h"

Package::Package(const string & sname, const string & saddress, const string & scity, const string & sstate, const string & szip, const string & rname, const string & raddress, const string & rcity, const string & rstate, const string & rzip, double weight, double shipCost) 


{ 
    senderName = sname; 
    senderAddress = saddress; 
    senderCity = scity; 
    senderState = sstate; 
    senderZip = szip; 
    recipientName = rname; 
    recipientAddress = raddress; 
    recipientCity = rcity; 
    recipientState = rstate; 
    recipientZip = rzip; 
    setWeight(weight); 
    setShip(shipCost); 

} 



void Package::setSenderName(const string & sname) 
{ 
    senderName = sname; 
} 

string Package::getSenderName() const 
{ 
    return senderName; 
} 



void Package::setSenderAddress(const string & saddress) 
{ 
    senderAddress = saddress; 
} 

string Package::getSenderAddress() const 
{ 
    return senderAddress; 
} 



void Package::setSenderCity(const string & scity) 
{ 
    senderCity = scity; 
} 

string Package::getSenderCity() const 
{ 
    return senderCity; 
} 




void Package::setSenderState(const string & sstate) 
{ 
    senderState = sstate; 
} 

string Package::getSenderState() const 
{ 
    return senderState; 
} 




void Package::setSenderZip(const string & szip) 
{ 
    senderZip = szip; 
} 

string Package::getSenderZip() const 
{ 
    return senderZip; 
} 




void Package::setRecipientName(const string & rname) 
{ 
    recipientName = rname; 
} 

string Package::getRecipientName() const 
{ 
    return recipientName; 
} 



void Package::setRecipientAddress(const string & raddress) 
{ 
    recipientAddress = raddress; 
} 

string Package::getRecipientAddress() const 
{ 
    return recipientAddress; 
} 



void Package::setRecipientCity(const string & rcity) 
{ 
    recipientCity = rcity; 
} 

string Package::getRecipientCity() const 
{ 
    return recipientCity; 
} 



void Package::setRecipientState(const string & rstate) 
{ 
    recipientState = rstate; 
} 

string Package::getRecipientState() const 
{ 
    return recipientState; 
} 


void Package::setRecipientZip(const string & rzip) 
{ 
    recipientZip = rzip; 
} 

string Package::getRecipientZip() const 
{ 
    return recipientZip; 
} 




void Package::setWeight(double weight) 
{ 
    weight = (weight < 0.0 ) ? 0.0 : weight; 
} 
double Package::getWeight() const 
{ 
    return weight; 
} 



void Package::setShip(double shipCost) 
{ 
    shipCost = ( shipCost < 0.0) ? 0.0 : shipCost; 
} 

double Package::getShip() const 
{ 
    return shipCost; 
} 

double Package::calculateCost() const 
{   
    return weight * shipCost;
} 

void Package::print() const
{
cout<<"Sender:"<<endl
    <<senderName<<endl
    <<senderAddress<<endl
    <<senderCity<<", "<<senderState<<" "<<senderZip<<endl
    <<endl
    <<"Recepient:"<<endl
    <<recipientName<<endl
    <<recipientAddress<<endl
    <<recipientCity<<", "<<recipientState<<" "<<recipientZip<<endl
    <<endl
    <<"Weight of package: "<<weight<<" oz."<<endl
    <<"Type of delivery: Regular Delivery"<<endl
    <<"Cost of package: $"<<calculateCost()<<endl;
}

//The class TwoDayPackage is the first derived class from class Package




//The class OverNightPackage is the second derived class from class Package

.

//main function

#include <iostream>
#include <iomanip>
#include <vector>

using namespace std;
using std::setprecision;

#include "Package.h"
/*#include"overnighttest.h"
#include"twoday2.h"*/
//Test File

int main() 
{ 
   Package message("chris beyer","1 westwood circle","edison","nj","08820","mike b","1 westwood cirle","edison","nj","08820",10.00,1.50);

    /*OverNightPackage box("John Doe", "789 Fire Street", "Hell", "MI", "48169", "Jane Doe", "987 Leg Sun Crossing", "Intercourse", "PA", "17534", 10.00, 1.50, .85); 

    TwoDayPackage parcel("John Doe", "789 Fire Street", "Hell", "MI", "48169", "Jane Doe", "987 Leg Sun Crossing", "Intercourse", "PA", "17534", 15.00, 1.05, 5.00);*/



    cout << fixed << setprecision(2); 

    cout<<"Package delivery services program"<<endl
    <<endl
    <<"Cost per ounce for a package: $.50/ounce"<<endl
    <<"Additional cost for two day delivery:  $2.00/ounce"<<endl
    <<"Additional cost for overnight delivery: $5.00/ounce"<<endl<<endl;


    vector<Package*> myPackages;

Package *messagePtr=&message;
/*TwoDayPackage *TDpPtr=&TDp;
OvernightPackage *OpPtr=&Op;*/

myPackages.push_back(messagePtr);
/*myPackages.push_back(TDpPtr);
myPackages.push_back(OpPtr);*/

double total=0;

for(int i=0;i<myPackages.size();i++)
{
    cout<<"Package #"<<i+1<<":"<<endl<<endl;
    (*myPackages[i]).print();
    cout<<endl;
    total+=(*myPackages[i]).calculateCost();
}

cout<<"Total cost for all the packages: $"<<total<<endl;

system("pause");

    return 0;


}

Answer 1

在您的 setter 中，您没有设置实例变量。例如:weight = (weight < 0.0) ? 0.0 : weight只是更改用于参数的临时变量。您可以更改参数的名称、更改实例变量的名称(推荐)，或使用语法 this->weight = ...