Thread: Trouble with linked list

I've tried using getline a few different times, and ran into some errors. I'd prefer to stick with the syntax I was using in the code I posted, does anyone know of a way to accomplish this?

I edited my file and played around trying to use getline again after your post, and compiles but seems to hangup somewhere, when the output screen comes up it immediately closes and I get a windows error.

Got it working. Will probably post back when I run into my next error along the way... ) thanks

I've got the linked list working (it seems at least). Now I want to query the user to add another node to the list.

Here's the linked list so far:

Code:

struct node
{
     string name;
     string ID;
     string address;
     node *next;
};


int main(int argc, char *argv[])
{
    string line;
    char add_resp[3];
    ifstream inFile ("A1.txt");
    node *head = NULL;
    
    for (int i = 0; i < 20; i++)
    {
    
        node *newPerson;
        node *person_ptr;
    
        
        newPerson = new node;
    
        //Get name
        getline(inFile, line);
        newPerson->name = line;
        
        //Get ID
        getline(inFile, line);
        newPerson->ID = line;
        
        //Get address
        getline(inFile, line);
        newPerson->address = line;

        newPerson->next = NULL;
        
        if (!head)
           head = newPerson;
        else
        {
            person_ptr = head;
            
            while (person_ptr->next)
               person_ptr = person_ptr->next;
               
            person_ptr->next = newPerson;
        }
        
        
    }

When I run my query and the user says 'yes' to adding a new person, the cout for entering the persons name shows up, but then skips straight to the cout for the persons ID, without any cin for the name. The cin comes for ID, then goes to cout for address, cin address, query, loop. It looks to me like they're all the same, so why is it skipping the name cin?

Code:

    cout << "Would you like to add a person to this list? yes / no" << endl;
    cin >> add_resp;
    while (add_resp == "yes")
    {
         int keepgoing = 1;
         while (keepgoing == 1)
         {
            node *newPerson;
            node *person_ptr;
            newPerson = new node;
        
            //Get name
            cout << "Enter the name for the person to be added formatted as last_name, first_name" << endl;
            getline(cin, line);
            newPerson->name = line;
            
            //Get ID
            cout << "Enter the ID number for " << newPerson->name << endl;
            getline(cin, line);
            newPerson->ID = line;
            
            //Get address
            cout << "Enter the entire address for the person to be added formatted as \"123 Main, Bigcity, SmallState Zipcode\"" << endl;
            getline(cin, line);
            newPerson->address = line;
    
            newPerson->next = NULL;
            
            if (!head)
               head = newPerson;
            else
            {
                person_ptr = head;
                
                while (person_ptr->next)
                   person_ptr = person_ptr->next;
                   
                person_ptr->next = newPerson;
            }
            cout << "Would you like to add another person to this list?" << endl;
            cin >> add_resp;
            if (add_resp == "no")
               keepgoing = 0;
         }
    }

Yeah, I looked that up and read through it.

What I need is to read info in from a txt file, store the info in linked list, show it to user, prompt user as to whether they want to add new nodes (persons name, id, address as members), then I have to sort it according to id (member within the nodes) and allow the user to search it according to a last name (part of the persons name, which is a member of the nodes).

It's due tomorrow though, and I've put way more time into trying to learn this than it should take. I can't get my head around how to do sort or search, and have several other minor issues (namely centered on the one I asked about with the last line printing multiple times due to loop). Oh well.