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-   -   I kind of need help on my program (http://www.programmingforums.org/showthread.php?t=15482)

verizondude Mar 25th, 2008 9:01 PM
I kind of need help on my program
 
Hi,
My partner and me are kind of new to c++ and we're working on a program that is rather hard(for our capabilities on c++). Our program is nearly finished and all we have to do is to allow our program to accept some data. The problem is that we want the user to be able to name his/her own structs as it will store their personal data/ students' data, but we don't know how :(. We also want the program to store the user defined names of the structs within another one that would allow data storage for each one of those names.
The closest thing we could actually get to solving my problem was a block of code that asked for number of names and names and stored them in a char array(which didn't really work as the user would then actually have to count all the letters of the names that he/her would want to put in:icon_eek:)
Anyway, here's the code if you want to look at it:
:
// Cesis2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <stdio.h>

char g_NewUser[15];
char g_NewPassword1[20];
int g_x=0;
int g_hi=0;
int g_show=0;
int g_y=0;
struct g_Personalinfo
        {
                char firstname[10];
                char lastname[15];
                int age;
                char school[30];
                char subject[30];
                int grade;
        };
struct g_student
        {
                char firstname[10];
                char lastname[15];
                int age;
                char school[30];
                int grade;
        };
int main()
{
        using namespace std;       
g_Personalinfo name;

menu:
    cout<<"Welcome to Cesis!!!"<<endl;
        cout<<"What Will You Like To Do?"<<endl;
        cout<<"1)Login"<<endl;
        cout<<"2)New User"<<endl;
        cout<<"3)Exit"<<endl;
        int menu;
        cin>>menu;
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;       
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;
switch (menu)
       
{
case 1:
        cout<<"Username:"<<endl;
        char username[15];
        cin>>username;
        cout<<"Password:"<<endl;
        char password[20];
        cin>>password;
        g_x=0;
        g_show=1;
        g_hi=1;
cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;       
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;
        goto accountinfo;
        break;
case 2:       
        cout<<"Username:"<<endl;
        cin>>g_NewUser;
        cout<<"Password:"<<endl;
        cin>>g_NewPassword1;
cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;       
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;
        goto newuser;               
        break;
case 3:
        cin.get();
        break;
default:
        cout<<"Error Error!!! \a \a"<<endl;
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;       
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;
        goto menu;
        break;   
}

newuser:       
        int newuser1;
g_x=1;
cout<< "Username and Password Comfirmed"<<endl;
cout<< "Choose Where To Go"<<endl;
cout<< "1) Put Account In FO SHO"<< endl;
cout<< "2} Loga Outa (that meens log out in gansta talk)"<< endl;
cin>> newuser1;
cout<<""<<endl;
cout<<""<<endl;
cout<<""<<endl;       
cout<<""<<endl;
cout<<""<<endl;
cout<<""<<endl;
switch (newuser1)       
{
case 1:
        cout<<"Going to Account In FO SHO"<< endl;
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;       
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;
        goto accountinfo;
        break;
case 2:
        goto menu;
        break;
default:
        goto menu;
        break; 
}
       
personalinfochange2:
        int la;
        int a=0;
        int b=0;
        int c=0;
        int d=0;
        int e=0;
        int f=0;

        if (g_y==0)
        {
                int w;
               
               
                cout<<"Please Type In Your First Name:";
                cin>>name.firstname;
                cout<<"Please Type In Your Last Name:";
                cin>>name.lastname;
                cout<<"Please Type In Your Age:";
                cin>>name.age;
                cout<<"Please Type In Your School's Name:";
                cin>>name.school;
                cout<<"Please Type In Your Profession's Subject (If You Have More Then One Then One Subject, Type A Comma After Each One:";
                cin>>name.subject;
                cout<<"Please Type In Your Profession's Grade Level:";
                cin>>name.grade;
                cout<<""<<endl;
                cout<<""<<endl;
                cout<<""<<endl;       
                cout<<""<<endl;
                cout<<""<<endl;
                cout<<""<<endl;
                g_y=1;
                goto switchy;
        }
        else
        {
                cout<<"What Information Would You Like To Change?"<<endl;
                cout<<"1. First Name:"<<name.firstname<<endl;
                cout<<"2. Last Name:"<<name.lastname<<endl;
                cout<<"3. Age:"<<name.age<<endl;
                cout<<"4. School:"<<name.school<<endl;
                cout<<"5. Profession's Subject(s):"<<name.subject<<endl;
                cout<<"6. Profession's Grade Level:"<<name.grade<<endl;
                cin>>la;
                cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;       
        cout<<""<<endl;
        cout<<""<<endl;
        cout<<""<<endl;
                        switch(la)
                {
                case 1:
                        cout<<"Changeing Information to:";
                        cin>>name.firstname;
                        cout<<"Is This the Correct Information?"<<endl;
                        cout<<"First Name:"<<name.firstname<<endl;
                        cout<<"1)Yes Or 2)No?"<<endl;
                        cin>>a;
                        switch(a)
                        {
                                        case 1:
                                                        cout<<"Thank You... Returning Back to Acount Info"<<endl;
                                                        goto accountinfo;
                                                        break;
                                        case 2:
                                                        cout<<"Please Retry Again..."<<endl;
                                                        cout<<"Going Back To Account Info Change Menu"<<endl;
                                                        goto personalinfochange2;
                                                        break;
                                        default:
                                                        cout<<"Error Error! \a  \a "<<endl;
                                                        goto personalinfochange2;
                                                        break;
                        }
                        break;
                case 2:
                                cout<<"Changeing Information to:";
                        cin>>name.lastname;
                        cout<<"Is This the Correct Information?"<<endl;
                        cout<<"Last Name:"<<name.lastname<<endl;
                        cout<<"1)Yes Or 2)No?"<<endl;
                        cin>>b;
                        switch(b)
                        {
                                        case 1:
                                                        cout<<"Thank You... Returning Back to Acount Info"<<endl;
                                                        goto accountinfo;
                                                        break;
                                        case 2:
                                                        cout<<"Please Retry Again..."<<endl;
                                                        cout<<"Going Back To Account Info Change Menu"<<endl;
                                                        goto personalinfochange2;
                                                        break;
                                        default:
                                                        cout<<"Error Error! \a  \a "<<endl;
                                                        goto personalinfochange2;
                                                        break;
                        }
                        break;
                case 3:
                                cout<<"Changeing Information to:";
                        cin>>name.age;
                        cout<<"Is This the Correct Information?"<<endl;
                        cout<<"Age:"<<name.age<<endl;
                        cout<<"1)Yes Or 2)No?"<<endl;
                        cin>>c;
                        switch(c)
                        {
                                        case 1:
                                                        cout<<"Thank You... Returning Back to Acount Info"<<endl;
                                                        goto accountinfo;
                                                        break;
                                        case 2:
                                                        cout<<"Please Retry Again..."<<endl;
                                                        cout<<"Going Back To Account Info Change Menu"<<endl;
                                                        goto personalinfochange2;
                                                        break;
                                        default:
                                                        cout<<"Error Error! \a  \a "<<endl;
                                                        goto personalinfochange2;
                                                        break;
                        }
                        break;
                case 4:
                                cout<<"Changeing Information to:";
                        cin>>name.school;
                        cout<<"Is This the Correct Information?"<<endl;
                        cout<<"School:"<<name.school<<endl;
                        cout<<"1)Yes Or 2)No?"<<endl;
                        cin>>d;
                        switch(d)
                        {
                                        case 1:
                                                        cout<<"Thank You... Returning Back to Acount Info"<<endl;
                                                        goto accountinfo;
                                                        break;
                                        case 2:
                                                        cout<<"Please Retry Again..."<<endl;
                                                        cout<<"Going Back To Account Info Change Menu"<<endl;
                                                        goto personalinfochange2;
                                                        break;
                                        default:
                                                        cout<<"Error Error! \a  \a "<<endl;
                                                        goto personalinfochange2;
                                                        break;
                        }
                        break;
                case 5:
                                cout<<"Changeing Information to:";
                        cin>>name.subject;
                        cout<<"Is This the Correct Information?"<<endl;
                        cout<<"Profession's Subject:"<<name.subject<<endl;
                        cout<<"1)Yes Or 2)No?"<<endl;
                        cin>>e;
                        switch(e)
                        {
                                        case 1:
                                                        cout<<"Thank You... Returning Back to Acount Info"<<endl;
                                                        goto accountinfo;
                                                        break;
                                        case 2:
                                                        cout<<"Please Retry Again..."<<endl;
                                                        cout<<"Going Back To Account Info Change Menu"<<endl;
                                                        goto personalinfochange2;
                                                        break;
                                        default:
                                                        cout<<"Error Error! \a  \a "<<endl;
                                                        goto personalinfochange2;
                                                        break;
                        }
                        break;       
                case 6:
                        cout<<"Changeing Information to:";
                        cin>>name.grade;
                        cout<<"Is This the Correct Information?"<<endl;
                        cout<<"Profession's Grade:"<<name.grade<<endl;
                        cout<<"1)Yes Or 2)No?"<<endl;
                        cin>>f;
                        switch(f)
                        {
                                        case 1:
                                                        cout<<"Thank You... Returning Back to Acount Info"<<endl;
                                                        goto accountinfo;
                                                        break;
                                        case 2:
                                                        cout<<"Please Retry Again..."<<endl;
                                                        cout<<"Going Back To Account Info Change Menu"<<endl;
                                                        goto personalinfochange2;
                                                        break;
                                        default:
                                                        cout<<"Error Error! \a  \a "<<endl;
                                                        goto personalinfochange2;
                                                        break;
                        }
                default:
                                cout<<"Error Error! \a  \a "<<endl;
                                goto personalinfochange2;
                                break;
                        }
               
                }



switchy:
                int w;
                cout<< "Here is the Info You Put In."<< endl << "First Name:" << name.firstname << endl << "Last Name:" << name.lastname << endl << "Age:" << name.age << endl << "School's Name:" << name.school << endl << "Subjects:" << name.subject << endl << "Grade:" << name.grade << endl;
                cout<< "Is The Info Correct?"<<endl;
                cout<< "1)Yes or 2)No"<<endl;
                cin>>w;

                switch(w)
                {
                case 1:
                        cout<<"Going Back to AccountInfo"<<endl;
                        g_hi=1;
                        g_show=1;
                        goto accountinfo;
                        break;
                        g_y=1;
                case 2:
                        cout<<"Please Re-Type Everthing:"<<endl;
                        goto personalinfochange2;
                        break;
                default:
                        cout<<"Error Error! \a  \a "<<endl;
                        goto switchy;
                        break;
                }
        accountinfo:
                if (g_x==1)
                {
                        int y;
                        cout<<"Welcome New User! I would like to know more about you to increase our knowledge.";
                        cout<<"Please go to New Info and type in your info. We would appriciate it if you told us the right infomation about you."<<endl;
                        cout<<"What do you want to do?"<<endl;
                        cout<<"1.Put in new info"<<endl;
                        cout<<"2.Go to account menu"<<endl;
                        cout<<"3.Go to main menu"<<endl;
                        cout<<"4.Log out"<<endl;
                        cin>>y;
                                switch (y)
                                {
                                case 1:
                                        g_x=0;
                                        goto personalinfochange;
                                        break;
                                case 2:
                                        g_x=0;
                                        goto accountinfo;
                                        break;
                                case 3:
                                        g_x=0;
                                    goto menu;
                                        break;
                                case 4:
                                        cin.get();
                                        g_x=0;
                                        break;
                                default:
                                        cout<<"Error Error! \a  \a "<<endl;
                                        goto accountinfo;
                                        break;
                                }
                }
                else
                { goto show1;}
show1:       
                if(g_show==1)
                {       
                        int z;
               
                        cout<<""<<endl;
                        cout<<"Welcome Back... What do you want to do?"<<endl;
                        cout<<"1)Change Account Info"<<endl;
                        cout<<"2)Go To Student Info"<<endl;
                        cout<<"3)Show Information About Yourself"<<endl;
                        cout<<"4)Log Out"<<endl;
                        cin>>z;

                        switch (z)
                        {
                                case 1:
                                        goto personalinfochange;
                                        break;
                                case 2:
                                        goto studentinfo;
                                        break;
                                case 3:
                                        goto switchy;
                                        break;
                                case 4:
                                        cout<<"Logging Out";
                                    goto menu;
                                        break;
                                default:
                                        cout<<"Error Error! \a  \a "<<endl;
                                        goto accountinfo;
                                        break;
                                }
                        }
                        else
                        {
                        int z;
                        cout<<"Welcome Back... What do you want to do?"<<endl;
                        cout<<"1)Change Account Info"<<endl;
                        cout<<"2)Go To Student Info"<<endl;
                        cout<<"3)Log Out"<<endl;
                        cin>>z;

                        switch (z)
                        {
                                case 1:
                                        goto personalinfochange;
                                        break;
                                case 2:
                                        goto studentinfo;
                                        break;
                                case 3:
                                        cout<<"Logging Out";
                                    goto menu;
                                        break;
                                default:
                                        cout<<"Error Error! \a  \a "<<endl;
                                        goto accountinfo;
                                        break;
                                }
                        }
               



personalinfochange:
                int ppedpdsa;
                cout<<"Want to Change Your Personnal Info?"<<endl;
                cout<<"Please type in 1(Yes) or 2(No)"<<endl;
                cin>> ppedpdsa;
                switch (ppedpdsa)
                        {
                                        case 1:
                                                goto personalinfochange2;
                                        break;
                                case 2:
                                        cout<<"Going Back To Account Menu"<<endl;
                                        goto accountinfo;
                                        break;
                                default:
                                        cout<<"Error Error! \a  \a "<<endl;
                                        goto personalinfochange;
                                        break;
                       
                        }
studentinfo:
                        int LALALAL;
                        cout<<"Welcome To Your Students Information"<<endl;
                        cout<<"If You're New, We Recommend Making New Students, Then Making A New Class"<<endl;
                        cout<<""<<endl;
                        cout<<"What Will You Like to Do?"<<endl;
                        cout<<"1)View All Your Classes"<<endl;
                        cout<<"2)Make A New Class"<<endl;
                        cout<<"3)Make A New Student";
                        cin>>LALALAL;
                                switch (LALALAL)
                        {
                                case 1:
                                        cout<<"Going To Classes"<<endl;
                                       
                                        break;
                                case 2:
                                       
                                        break;
                                case 3:
                                        goto createnewstudent;
                                        break;
                                default:
                                        cout<<"Error Error! \a  \a "<<endl;
                                        goto studentinfo;
                                        break;
                        }
createnewstudent:
                cout<<"How many students do you have?"<<endl;
                int number;
                cin>>number;
                while (number>0)
                {
                        cout<<"Name?"<<endl;

                        number--;
                }
                        system("pause");                       

        return 0;
               
                }
Thank You for helping us with our problems!!!:):)

OpenLoop Mar 25th, 2008 10:07 PM
Re: I kind of need help on my program
 
What do you mean with "name his/her own structs"? Are you saying you want the users to name the actual object of the struct??? Users shouldn't even know that you're using a struct, all they care about is that you save their information. You can declare an array of struct objects (100 for example) and then use them as needed. Or if you want to get fancy, look into Vector (dynamic) arrays.

On a side note, why not use the string class instead of all the char[] arrays:
:
  1. #include <string>
  2.  
  3. ...
  4. string username;
  5. cin>>username;
  6. cout>>username;
  7. ...

Ooble Mar 26th, 2008 6:26 AM
Re: I kind of need help on my program
 
If you mean you want them to name each block of information (that you store in a struct) so they can find it later, you can use a map to do it:
:
struct blockOfInfo oldInfo, newInfo;

std:map<string, struct blockOfInfo> info;
info["name"] = oldInfo;
newInfo = info["name"];

Cprogramming.com has a good tutorial on maps.

verizondude Mar 26th, 2008 9:52 AM
Re: I kind of need help on my program
 
What we want to do is to make a struct that can be remade into diffrent type of that struct. Like you want to add a new student to your database. we use the student struct to get his information. we want it so that all the diffrent students have a diffrent struct so that we dont have manually add a new struct every time some is new. so its automated.

lectricpharaoh Mar 26th, 2008 7:46 PM
Re: I kind of need help on my program
 
Quote:
Originally Posted by verizondude
What we want to do is to make a struct that can be remade into diffrent type of that struct. Like you want to add a new student to your database. we use the student struct to get his information. we want it so that all the diffrent students have a diffrent struct so that we dont have manually add a new struct every time some is new. so its automated.
Ahh. what you want, then, is a collection of structs. The simplest is an array or vector. As you seem to have already covered arrays, just use one of those. A vector is a type from the standard template library that is an abstraction of an array; it provides very similar functionality, with some added perks such as range-checking and the ability to be resized.

Soulstorm Mar 27th, 2008 8:07 AM
Re: I kind of need help on my program
 
Quote:
Originally Posted by verizondude (Post 142987)
What we want to do is to make a struct that can be remade into diffrent type of that struct. Like you want to add a new student to your database. we use the student struct to get his information. we want it so that all the diffrent students have a diffrent struct so that we dont have manually add a new struct every time some is new. so its automated.
Hm... Maybe I didn't understand well, but you have encountered a problem where different students have a different set of attributes, and so you may need a specific struct to define each one?

Well, if that's the case you should also look into classes and inheritance. You will need to make a base class and then make subclasses to cover all your needs. You can then add any subclass of that base class into a vector or an array and process them.

verizondude Mar 31st, 2008 7:00 PM
Re: I kind of need help on my program
 
Quote:
Originally Posted by lectricpharaoh (Post 143029)
Ahh. what you want, then, is a collection of structs. The simplest is an array or vector. As you seem to have already covered arrays, just use one of those. A vector is a type from the standard template library that is an abstraction of an array; it provides very similar functionality, with some added perks such as range-checking and the ability to be resized.
Well seeing a vector as like being a massive array, wouldn't the user have to count the characters he/she would want to plug in?

lectricpharaoh Apr 1st, 2008 3:14 PM
Re: I kind of need help on my program
 
Quote:
Originally Posted by verizondude
Well seeing a vector as like being a massive array, wouldn't the user have to count the characters he/she would want to plug in?
For any data type that is a collection of elements, space needs to be allocated for the elements.

As an example, imagine a C-style string (array of char, with the string's end marked by a zero). You need to allocate space for the string plus an additional char element for the zero terminator. However, there are data structures that hide this sort of thing from you. The C++ string class is a good example. It allocates a block behind the scenes- say 20 characters- and tracks the current length of the string. It then allocates a larger block if it needs to, but this is all hidden from the user of the class.

A vector is similar. Say you have a struct defined like so:
:
  1. struct g_Personalinfo
  2. {
  3.   char firstname[10];
  4.   char lastname[15];
  5.   int age;
  6.   char school[30];
  7.   char subject[30];
  8.   int grade;
  9. };
This does not actually create an instance. Rather, it only tells compiler what the type is composed of, so you can use it. I'm sure you already know this part. You need to create one or more instances, but you can create them either one at a time, or a bunch at once in an array:
:
  1. g_Personalinfo singleItem;
  2. g_Personalinfo arrayOfItems[100];  // room for 100 elements
If you use the array, you have to provide a subscript, just like with any other array access:
:
  1. arrayOfItems[7].age = 19;
Now, this all works dandy until you exceed 100 students, or whatever type your array holds. It also means if you use less, you're wasting space. A vector is a better solution here. The syntax looks a bit funny, because vector is actually a template; think of a template as a layout, with an actual type filled in at runtime. It will look something like this:
:
  1. // remember to #include <vector>
  2. vector<g_Personalinfo> vectorOfItems(100);  // 100 elements
You can then use it with array-style subscript notation, and you can 'push' elements on the end of the vector, or 'insert' them in the middle. If the vector is full when you add an element, it will resize itself. Thus, you don't need to worry so much about the size. There are methods for controlling how much space it reserves, and how it resizes itself, if you're paranoid it'll reserve too much (wasting space) or too little (meaning resizing happens more often, and resizing tends to be a slow operation).

The upshot of all this is that the user will not need to know in advance how many items they're inputting. The vector is sized to a default or specified size, and if this turns out to be too small, it will grow as needed.

Anyways, you can read all about vectors right here (this reference in general is quite helpful and to-the-point, I find).

verizondude Apr 24th, 2008 9:41 AM
Re: I kind of need help on my program
 
Ok I got the idea, thanks lectripharaoh


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