function linked list validation help

This is a discussion on function linked list validation help within the C++ Programming forums, part of the General Programming Boards category; hi everyone, can someone tells me whats wrong with this piece of code. i cant figured it out. i get ...

  1. #1
    Registered User
    Join Date
    Oct 2010
    Posts
    19

    function linked list validation help

    hi everyone, can someone tells me whats wrong with this piece of code. i cant figured it out. i get an error: lastname was not declared in this scope in structure.h (in function: newEntry @ line } while (!checkString(lastname, 1));
    i will be grateful if someone can help.

    here is the part of my structure.h
    Code:
    #include <iomanip>
    
    struct contact
    {
        char lastname[15];
        char initial[2];
        char firstname[15];
        char street[20];
        char city[15];
        char state[15];
        char country[20];
        char telephone[15];
        char email[20];
        contact *next;
    };
    
    void newEntry()
    {
        contact *root; //This will not changeor we lose the list in memory
        contact *conductor; //This will point to each node as it moves downthe list
    
        root = new contact; //Sets the root to point to something actually
        root -> next = 0; //Otherwise it will not work well
    
    
        char continueNewEntry = 'Y';
    
        do
        {
            clearScreen();
            showTitle();
            centerString("NEW Contact");
            centerString("--------------------------");
    
            do
            {
                cout << "Last Name: ";
                cin >> root -> lastname;
            } while (!checkString(lastname, 1));
    
            do
            {
                cout << "Initial: ";
                cin >> root -> initial;
            } while (!checkString(initial, 2));

    here is part of my validation.h
    Code:
    bool checkString(char* str, int n)
    {
        unsigned int i;
    
        if (n == 1)
        {
            if (strlen(str) == 0 || strlen(str) > 15)
            {
                cout << "Field is limited to 15 characters & must not be empty!";
                return false;
            }
    
            else
                return true;
        }
    
        if (n == 2)
        {
            if (strlen(str) > 2)
            {
                cout << "Field is limited to 2 characters!";
                return false;
            }
    
            else
                return true;
        }
    Here is my header file for main.cpp

    #include <iostream>
    #include <string.h>
    #include <fstream>
    #include "ui.h"
    #include "structure.h"
    #include "validation.h"

    Thank you in advance friends

  2. #2
    Registered User
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    Location
    Poland
    Posts
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    lastname is a member of contact struct and you need to point which struct instance you mean:
    Code:
    } while (!checkString(root->lastname, 1));
    Like the line before:
    Code:
    cin >> root -> lastname;
    I never put signature, but I decided to make an exception.

  3. #3
    Registered User whiteflags's Avatar
    Join Date
    Apr 2006
    Location
    United States
    Posts
    7,525
    The closest thing you have to lastname in the structure.h file is in contact. Take for example, the root contact: you access it like
    root->lastname

    When you do it in the call for checkString, you typed this:
    while (!checkString(lastname, 1));
    This refers to a "lastname" variable different from the ones in contact.

    So, that explains the error.

    Why do you have program code in an h file? Most of this belongs in a cpp file.

  4. #4
    Registered User
    Join Date
    Oct 2010
    Posts
    19
    Thank you kmdv. will try it tomorrow since its kind late here.

  5. #5
    Registered User
    Join Date
    Oct 2010
    Posts
    19
    @whiteflags i was in a hurry. behind schedule. will arrange the code later. thank you

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