如何更改以下代码以从文本文件中读取多个地址而不是硬编码信息？

Question

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How do I change the following code to read multiple addresses from a text file instead of the hard coded information in the following line? Please help!

"customerData c("Donald","Allen","abc apartment","Newyork","Newyork",10001,"6667676222", 1016,false);"

This is the actual assignment:

**Design a class named PersonData with the following member variables: lastName firstName address city state zip phone customerNumber mailingList Write the appropriate accessor and mutator functions for these member variables. The customerNumber variable will be used to hold a unique integer for each customer and you must manage the uniqueness of this variable using a static member variable. The mailingList variable should be a bool and will be set to true if the customer wishes to be on a mailing list, or false if the customer does not wish to be on a mailing list. Demonstrate, in a simple printing program, an array of objects from this class, where customer data is read from a file and then into the array of objects using their set() member functions. Once all data is read and the array is populated, the program should print out, using get() member functions, all the info for customers that would like to be included in the mailing list.

A Sample text file CustomerInfo.txt will be included with this document.**

Here is what I have so far:

 #include<iostream>
    using namespace std;
    //Person class definition
    class Personaldata
    {
    private:  
           //instance variables declaration
       string Lastname;
       string Firstname;
       string Address;
       string City;
       string State;
       int Zipcode;
       string Phone;
    public:
       //constructor to initialize variables
       Personaldata(string lName,string fName,string addr,string pCity,
           string pState,int zCode,string pPhone)
       {
           Lastname=lName;
           Firstname=fName;
           Address=addr;
           City=pCity;
           State=pState;
           Zipcode=zCode;
           Phone=pPhone;
           }
           //getter methods to return Latname,Firstname,Address,City,State,Zipcode and Phone
           string getLaststname()
           {
               return Lastname;
           }
           string getFirstname()
           {
               return Firstname;
           }
           string getAddress()
           {
               return Address;
           }
           string getCity()
           {
               return City;
           }
           string getState()
           {
               return State;
           }
           int getZipcode()
           {
               return Zipcode;
           }
           string getPhone()
           {
               return Phone;
           }
           //setter methods to set Latname,Firstname,Address,City,State,Zipcode and Phone
           void setLasstname(string lName)
           {
               Lastname=lName;
           }
           void setFirstname(string fName)
           {
               Firstname=fName;
           }
           void setAddress(string addr)
           {
               Address=addr;
           }
           void setCity(string pCity)
           {
               City=pCity;
           }
           void setState(string pState)
           {
               State=pState;
           }
           void setZipcode(int zCode)
           {
               Zipcode=zCode;
           }
           void setPhone(string pPhone)
           {
               Phone=pPhone;
           }
    };
    //customerData class derived from Personaldata class
    class customerData:public Personaldata
    {
       private:  
           //instance variables declaration
       int customerNumber;
       bool mailingList;
       public:
           //constructor to initialize variables
           //pase values into base class's constructor
           customerData(string lName,string fName,string addr,
           string pCity,string pState,int zCode,string pPhone,int number,bool mailing):
           Personaldata(lName,fName,addr,pCity,pState,zCode,pPhone)
       {
           customerNumber=number;
           mailingList=mailing;
       }
       //getter method to return customerNumber and mailingList
       int getCustomerNumber()
       {
           return customerNumber;
           }
           bool isMailingList()
       {
           return mailingList;
           }
           //setter method to set customerNumber and mailingList
           void setCustomerNumber(int number)
       {
           customerNumber=number;
           }
           void setMailingList(bool mailing)
       {
           mailingList=mailing;
           }
    };
    int main()
    {
       //create an object of customerData class
       customerData c("Donald","Allen","abc apartment","Newyork","Newyork",10001,"6667676222", 1016,false);
       //change mailingList and Address using setter methods
       c.setMailingList(true);
       c.setAddress("xyz apartment");
       //display details of object using getter methods
       cout<<"Customer name: "<<c.getFirstname()<<" "<<c.getLaststname()<<endl;
       cout<<"Address: "<<c.getAddress()<<endl;
       cout<<"City: "<<c.getCity()<<endl;
       cout<<"State: "<<c.getState()<<endl;
       cout<<"Zip code: "<<c.getZipcode()<<endl;
       cout<<"Phone: "<<c.getPhone()<<endl;
       cout<<"Customer number: "<<c.getCustomerNumber()<<endl;
       cout<<"Is customer wishes to be in mailing list?: "<<c.isMailingList()<<endl;
       return 0;
    }

Answer 1

First of all, you need to understand the format of the data stored on file. For example, are the data stored as CSV (comma separated values)? Do they use the JSON format? You definitely need to know how the file is formatted before moving forward.

Once you figure that out, the next would be to write a function for reading from it. I'm not going to provide a solution. But here is the link to a resource you might want to check: https://www.w3schools.com/cpp/cpp_files.asp You can find much more stuffs on internet, anyway. Probably some snippets of code that solve a similar problem and that you can study.

In general the approach would be:

1. Open File in Read Mode
2. If file is opened, move forward.
3. Until you have lines to read:

• Read one line (this is very generic here, you might need to skip some lines if you have a header section, for example)
• Parse the line. If you consider each line referring to a person and the space is used for separating values, then you might want to split the line based on the space. A quick search on google gives me this link:https://www.techiedelight.com/split-string-cpp-using-delimiter/
• Assign the values to the variables that you have defined in your class. Make sure to convert to float, int, whatever, as needed.

4. Do whatever else your code is supposed to do.

Hope this helps.