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C++ HW Error

Sep 12, 2019 at 3:49am
simulationspecimen (27)
Almost done with my a program I have to do. The only thing stopping me is one error.


It says: Use of undeclared identifier "insertlist"

It is in my readem function. Basically what I'm trying to do is read my data from my data file.

Here is my full code. 

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#include<iostream>
#include<string>
#include<iomanip>
#include<fstream>

using namespace std;

struct listtype
{
    string first;
    string last;
    int id;
    listtype *link;
};

void createlist(listtype *&head, listtype *&tail)
{
    head = new listtype;
    tail = new listtype;
    
    head->first = " AAA";
    tail->first = "zzz";
    head->last = " AAA";
    tail->last= "zzz";
    head->link = tail;
    tail->link = NULL;
    head->id = -1;
    tail->id = 9999;
}

bool emptylist(listtype *head, listtype *tail)
{
    return (head->link == tail);
}

void readem(listtype *head, listtype *tail)
{
    ifstream inf("data.txt");
    
    string last, first;
    int id = 0;
    
    while (!inf.eof())
    {
        inf >> last >> first >> id;
        insertlist(head, tail, id, first, last);
    }
    
}

void traverselist(listtype *head, listtype *tail, ofstream &outf)
{
    listtype *c;
    
    if (!emptylist (head, tail))
    {
        head->link = c;
        outf << setw(15) << "First" << setw(20) << "Last" << endl << setw(15) << "ID"
        << setw(15) << "Name" << setw(15) << "Name" << endl;
        
        for (int i = 0; i < 29; i++) outf << "-";
        outf << endl;
        
        while (c != tail)
        {
            outf << c->id << setw(10) << c->first << setw(15) << c->last << endl;
            c->link = c;
        }
        
        for (int i = 0; i < 29; i++) outf << "-";
        outf << endl;
    }
    
    
    
}

void deletelist(ofstream &outf, listtype *head, listtype *tail, string lastname)
{
    listtype *prior, *next, *c;
    
    c->last = lastname;
    prior = head;
    head->link = c;
    c->link = next;
    
    while (next != tail && c->last < lastname)
    {
        prior = c;
        c->link = c;
        next->link = next;
    }
    
    if (c != tail && c->last == lastname)
    {
        prior->link = next;
        delete c;
    }
    
    else
    {
        outf << lastname << " is not in the list and could not be removed" << endl;
    }
}

void insertlist(listtype *head, listtype *tail, int id,  string firstname, string lastname)
{
    listtype *knew, *prior, *next;
    knew = new listtype;
    
    knew->id = id;
    knew->first = firstname;
    knew->last = lastname;
    
    prior = head;
    head->link = next;
    
    while (next != tail && knew->last > next->last)
    {
        prior = next;
        next->link = next;
    }
    
    prior->link = knew;
    knew->link = next;
}

int main()
{
    ofstream outf;
    outf.open("output.txt");
    listtype *head, *tail;
    createlist(head, tail);
    emptylist(head, tail);
    readem(head, tail);
    traverselist(head, tail, outf);
    insertlist(head, tail, 555, "Luke", "Skywalker");
    traverselist(head, tail, outf);
    deletelist(outf, head, tail, "Organa");
    traverselist(head, tail, outf);
    system("pause");
    return 0;
    
}
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Last edited on Sep 12, 2019 at 3:49am
Sep 12, 2019 at 3:58am
JLBorges (13770)
Declare insertlist before you try to use it.
And pay attention to the (two) warnings (this is important).

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#include<iostream>
#include<string>
#include<iomanip>
#include<fstream>

using namespace std;

struct listtype
{
    string first;
    string last;
    int id;
    listtype *link;
};

void createlist(listtype *&head, listtype *&tail)
{
    head = new listtype;
    tail = new listtype;

    head->first = " AAA";
    tail->first = "zzz";
    head->last = " AAA";
    tail->last= "zzz";
    head->link = tail;
    tail->link = nullptr;
    head->id = -1;
    tail->id = 9999;
}

bool emptylist(listtype *head, listtype *tail)
{
    return (head->link == tail);
}

// declare thje function
void insertlist(listtype *head, listtype *tail, int id,  string firstname, string lastname) ;

void readem(listtype *head, listtype *tail)
{
    ifstream inf("data.txt");

    string last, first;
    int id = 0;

    while (!inf.eof())
    {
        inf >> last >> first >> id;
        insertlist(head, tail, id, first, last);
    }

}

void traverselist(listtype *head, listtype *tail, ofstream &outf)
{
    listtype *c;

    if (!emptylist (head, tail))
    {
        ///////////////////////////////////////////////////////////////////////////////
        head->link = c; // *** warning *** variable 'c' is uninitialized when used here
        /////////////////////////////////////////////////////////////////////////////////
        outf << setw(15) << "First" << setw(20) << "Last" << endl << setw(15) << "ID"
        << setw(15) << "Name" << setw(15) << "Name" << endl;

        for (int i = 0; i < 29; i++) outf << "-";
        outf << endl;

        while (c != tail)
        {
            outf << c->id << setw(10) << c->first << setw(15) << c->last << endl;
            c->link = c;
        }

        for (int i = 0; i < 29; i++) outf << "-";
        outf << endl;
    }



}

void deletelist(ofstream &outf, listtype *head, listtype *tail, string lastname)
{
    listtype *prior, *next, *c;

    c->last = lastname;
    prior = head;
    head->link = c;
    ////////////////////////////////////////////////////////////////////////////
    c->link = next; // *** warning *** variable 'next' is uninitialized when used here 
    ///////////////////////////////////////////////////////////////////////////

    while (next != tail && c->last < lastname)
    {
        prior = c;
        c->link = c;
        next->link = next;
    }

    if (c != tail && c->last == lastname)
    {
        prior->link = next;
        delete c;
    }

    else
    {
        outf << lastname << " is not in the list and could not be removed" << endl;
    }
}

void insertlist(listtype *head, listtype *tail, int id,  string firstname, string lastname)
{
    listtype *knew, *prior, *next;
    knew = new listtype;

    knew->id = id;
    knew->first = firstname;
    knew->last = lastname;

    prior = head;
    head->link = next;

    while (next != tail && knew->last > next->last)
    {
        prior = next;
        next->link = next;
    }

    prior->link = knew;
    knew->link = next;
}

int main()
{
    ofstream outf;
    outf.open("output.txt");
    listtype *head, *tail;
    createlist(head, tail);
    emptylist(head, tail);
    readem(head, tail);
    traverselist(head, tail, outf);
    insertlist(head, tail, 555, "Luke", "Skywalker");
    traverselist(head, tail, outf);
    deletelist(outf, head, tail, "Organa");
    traverselist(head, tail, outf);
    system("pause");
    return 0;

}
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