having probs with adding vector member for class with push_back funct

This is a discussion on having probs with adding vector member for class with push_back funct within the C++ Programming forums, part of the General Programming Boards category; I am having probs in the addApt function where I am using the push_back function to add another vector. when ...

  1. #1
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    Nov 2007
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    having probs with adding vector member for class with push_back funct

    I am having probs in the addApt function where I am using the push_back function to add another vector. when I run the prog and add an apt, it doesn't actually add the apt even though the "success" statement has shown from my apartment constructor. I think it might have something to do with having the constructor in the parameter for the push_back function but I am unsure. thanks for your help!!!

    Code:
    #include <iostream>
    #include <string>
    #include "apartment.h"
    #include <vector>
    
    using namespace std;
    
    void displayHeader();
    //displays program header
    void displayMenu();
    //displays main menu
    void addApt(vector<apartment> currentApt);
    //precondition: able to add vector if apt does not exist
    //postcondition: adds record to currentApt
    void delApt(vector<apartment> currentApt);
    //precondition: able to delete vector if apt exists and there is no rent due
    //postcondition: vector is removed from currentApt
    int searchForApt(vector<apartment> currentApt, int build_num, int apt_num);
    //preconditin: able to search for a particular record if currentApt is populated
    //postcondition returns vector position of record if found and -1 if not found
    void makePmt(vector<apartment> currentApt);
    //precondition: able to reduce current balance if apt exists and payment doesn't exceed balance
    //postcondition: amtDue is reduced by amount
    void displayInfo(vector<apartment> currentApt);
    //displays the list of the current apts and their respective info
    void addRent(vector<apartment> currentApt);
    //precondition: able to add one month's rent as long as the vectors exist
    //postcondition: increases amtDue by calculate_rent()
    
    <code>
    void main()
    {
    	int menuChoice;
    	vector<apartment> currentApt; //initializes vectors of apartments
    	do
    	{
    		displayMenu(); //display the main menu
    		cin>>menuChoice; //receive choice for main menu
    		switch(menuChoice) //perform the following based on menu choice
    		{
    			case 1: //choice 1
    				addApt(currentApt); //add an apartment
    				break;
    			case 2: //choice 2
    				delApt(currentApt); //delete an apartment
    				break;
    			case 3: //choice 3
    				makePmt(currentApt); //make a rent payment
    				break;
    			case 4: //choice 4
    				displayInfo(currentApt); //display list of currently rented apts
    				break;
    			case 5: //choice 5
    				addRent(currentApt); //add one month's rent to currently rented apts
    				break;
    			case 6: //choice 6
    				break; //exit program
    			default: //perform the following for incorrect input
    				cout<<endl;
    				cout<<"CHOOSE 1 THROUGH 6"<<endl;
    				cin.ignore(100,'\n');
    				cin.get();
    				break;
    		}
    
    	}
    	while(menuChoice!=6); //perform while user doesn't wish to exit program
    	cout<<endl;
    	cout<<"GOODBYE"<<endl;
    	cout<<endl;
    }
    
    void displayHeader()
    {
    	for(int index=0;index<=100;index++) //clear the screen
    		cout<<endl;
    	cout<<"Apartment Complex Manager"<<endl;
    	cout<<endl;
    }
    
    void displayMenu()
    {
    	displayHeader(); //display the program header
    	cout<<"Menu"<<endl;
    	cout<<endl;
    	cout<<"1. Add an apartment"<<endl;
    	cout<<"2. Delete an apartment"<<endl;
    	cout<<"3. Make a payment for an apartment"<<endl;
    	cout<<"4. Display information for all apartments"<<endl;
    	cout<<"5. Add one month rent amount to all apartments"<<endl;
    	cout<<"6. Quit"<<endl;
    	cout<<endl;
    	cout<<"Select an option: ";
    }
    
    void addApt(vector<apartment> currentApt)
    {
    	int build_num, apt_num, apt_type, aptPosition;
    	bool view;
    	string cust_name;
    	displayHeader(); //display the program header
    	cout<<"1. Add an apartment"<<endl;
    	cout<<endl;
    	cout<<"Please enter building number: ";
    	cin>>build_num; //receive the bldg no
    	cout<<"Please enter an apartment number (3 digits): ";
    	cin>>apt_num; //receive the apt no
    	aptPosition=searchForApt(currentApt, build_num, apt_num); //search for apt in the vectors
    	if(aptPosition!=-1) //perform the following if the apt already exists
    	{
    		cout<<endl;
    		cout<<"THIS APARTMENT ALREADY EXISTS IN THE SYSTEM"<<endl;
    		currentApt[aptPosition].display_info(); //displays the existing apt's record
    		cin.ignore(100,'\n');
    		cin.get();
    		return; //exit the current function
    	}
    	cout<<"Please enter the type of the apartment (1 for 1-bedroom, 2 for 2-bedroom, and 3 for 3-bedroom): ";
    	cin>>apt_type; //receive the amt of rooms
    	cout<<"Does the apartment have a lake view?(1 for yes, 0 for no): ";
    	cin>>view; //receive the type of view
    	cout<<"Please enter the customer name: ";
    	cin>>cust_name; //receive the co name
    	currentApt.push_back(apartment(build_num,apt_num,apt_type,view,cust_name));
    }
    
    void delApt(vector<apartment> currentApt)
    {
    	int build_num, apt_num, aptPosition;
    	displayHeader(); //display the program header
    	cout<<"2. Delete an apartment"<<endl;
    	cout<<endl;
    	cout<<"Please enter a building number: ";
    	cin>>build_num; //receive the bldg no
    	cout<<"Please enter an apartment number (3 digits): ";
    	cin>>apt_num; //receive the apt no
    	aptPosition=searchForApt(currentApt, build_num, apt_num); //searches for vector of the apt
    	if(aptPosition==-1) //perform the following if the apt wasn't found
    	{
    		cout<<endl;
    		cout<<"COULD NOT FIND APARTMENT IN LIST"<<endl;
    		cin.ignore(100,'\n');
    		cin.get();
    		return; //exit the current function
    	}
    	if(currentApt[aptPosition].getAmtDue()>0) //perform the following if rent is still owed
    	{
    		cout<<endl;
    		cout<<"THIS APARTMENT CANNOT BE DELETED. AMOUNT DUE IS $"<<currentApt[aptPosition].getAmtDue(); //displays the amt of rent still owed
    		cin.ignore(100,'\n');
    		cin.get();
    		return; //exit the current function
    	}
    	currentApt.erase(currentApt.begin()+aptPosition); //deletes the vector of the unwanted member
    	cout<<endl;
    	cout<<"APARTMENT DELETED";
    	cin.ignore(100,'\n');
    	cin.get();
    }
    
    int searchForApt(vector<apartment> currentApt, int build_num, int apt_num)
    {
    	for(unsigned int index=0;index<currentApt.size();index++) //perform the following for the apt vectors
    	{
    		if(currentApt[index].getBldNo()==build_num&&currentApt[index].getAptNo()==apt_num) //perform the following if member is found
    			return index; //return the member's position
    	}
    	return -1; //return -1 if the member wasn't found
    }
    
    void makePmt(vector<apartment> currentApt)
    {
    	int build_num, apt_num, aptPosition;
    	double amount;
    	displayHeader(); //display the program header
    	cout<<"3. Make a payment for an apartment"<<endl;
    	cout<<endl;
    	cout<<"Please enter a building number: ";
    	cin>>build_num; //receive the bldg no
    	cout<<"Please enter an apartment number (3 digits): ";
    	cin>>apt_num; //receive the apt no
    	aptPosition=searchForApt(currentApt, build_num, apt_num); //search for the apt vector to make pmt on
    	if(aptPosition==-1) //perform the following if the apt wasn't found
    	{
    		cout<<endl;
    		cout<<"COULD NOT FIND APARTMENT IN LIST"<<endl;
    		cin.ignore(100,'\n');
    		cin.get();
    		return; //exit the current function
    	}
    	cout<<endl;
    	cout<<"Amount due: $"<<currentApt[aptPosition].getAmtDue()<<endl; //displays the current amt due
    	cout<<"Enter the amount you want to pay: ";
    	cin>>amount; //receives the amt intended to pay for apt
    	currentApt[aptPosition].pay_rent(amount); //decreases the current amt due by amount paid
    }
    
    void displayInfo(vector<apartment> currentApt)
    {
    	displayHeader(); //display the program header
    	cout<<"4. Display information for all apartments"<<endl;
    	cout<<endl;
    	if(currentApt.size()==0) //perform the following there are no apt vectors
    	{
    		cout<<"NO APARTMENTS EXIST IN LIST";
    		cin.ignore(100,'\n');
    		cin.get();
    		return; //exit the current function
    	}
    	for(unsigned int index=0;index<currentApt.size();index++) //perform the following for the amt of members in the list
    		currentApt[index].display_info(); //display the members of the array and their respective info
    	cin.ignore(100,'\n');
    	cin.get();
    }
    
    void addRent(vector<apartment> currentApt)
    {
    	displayHeader(); //display the program header
    	cout<<"5. Add one month rent amount to all apartments"<<endl;
    	if(currentApt.size()==0) //perform the following if their are no apts in the list
    	{
    		cout<<endl;
    		cout<<"THERE ARE NO APARTMENTS IN THE LIST";
    		cin.ignore(100,'\n');
    		cin.get();
    		return; //exit the current function
    	}
    	for(unsigned int index=0;index<currentApt.size();index++) //perform the following for the amt of rented apts
    		currentApt[index].new_month(); //add one month's rent to each apt
    	cout<<endl;
    	cout<<"PROCESSED";
    	cin.ignore(100,'\n');
    	cin.get();
    }

  2. #2
    ZuK
    ZuK is offline
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    If you want to modify the currentApt inside any of your functions you have to pass it by reference.
    Right now you modify a copy.
    e.g.
    Code:
    void addApt(vector<apartment> &currentApt)
    Kurt

  3. #3
    Registered User
    Join Date
    Nov 2007
    Posts
    2
    Quote Originally Posted by ZuK View Post
    If you want to modify the currentApt inside any of your functions you have to pass it by reference.
    Right now you modify a copy.
    e.g.
    Code:
    void addApt(vector<apartment> &currentApt)
    Kurt
    thanks thanks thanks thanks!!!!!!!!!

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