need help with Tracking user login

**~Kyo~** · 03-25-2012

I can try but I am posting via iPhone try something like this

Code:

bool PlaceData(int );

int myarray[5000];

int main()
{
   // set all values of array to -1 
   int value=0;
   while(value != -1)
   {
   cout<<"Enter a value: "; 
   cin>>value;
   if(value != -1) PlaceData(value);
   }
   return 0;
}

bool PlaceData(int v)
{
   for(int i = 0; i < 5000;i++)
   {
      if(myarray[i] == -1)// open spot
      {
         myarray[i] = v;
         return true;
      }
   }
   return false;
}

**erictu** · 03-28-2012

Code:

#include <iostream>
#include <cstdlib>


using namespace std;
void Displaylab(int *lab,int size)
{
    int i;
     for(i = 0; i < size; i++)
     lab[i] = 0;
     lab[i] = -1;
     return;
}
int **dynArray(int row, int cols)
{
    int **myPtr;
    int lab[4];
    myPtr = new int *[row];
    for(int i = 0; i < row; i++)
    myPtr[i] = new int[lab[i]];
    int i = 0;
    int size;
    if(myPtr[i] == 0)
    cout<<"empty";
    return myPtr;   
}


void getinput(int ID,int &Station,int &labnumb)
{
     cout<<"Enter your ID number: "<<endl;
     cin>>ID;
      cout<<"Enter your station number: "<<endl;
     cin>>Station;
      cout<<"Enter your lab number: "<<endl;
     cin>>labnumb;
     return;  
}
void logout(int **Array,int ID,int row,int lab[])
{
     int r,c;
     if(search(**Array,ID,row,r,c,lab))     //Here is my mistake

     dynArray[r][c] = 0;                        //this one also.Need some help on debugging or fix it
     cout<< "You have been logged out."<<endl;
    return;
}
void login(int **Array,int ID,int &Station,int &labnumb)
{
     getinput(ID,Station,labnumb);
     Array[labnumb-1][Station-1] = ID;  
     return;
     
}
bool search(int **Array,int ID,int row,int &r,int &c,int lab[])
{
     cout<<"Enter user ID to check: "<<endl;
     cin>>ID;
     bool found = false;
     for(int i = 0; i < row;i++)
     for(int j = 0; j < lab[i];j++)
     if(ID == Array[i][j])
     {
      found = true;
      r = i;
      c = j;
      
      }
     return found;
}     


void Menu(int **Array,int ID,int &Station,int &labnumb,int row,int &r,int &c,int lab[])
{
     int choice;
     cout<<"Enter 1 for login, 2 for search,3 for exit. "<<endl;
     cin>>choice;
     if(choice == 1)
         login(Array,ID,Station,labnumb);
     if(choice == 2)
         search(Array,ID,row,r,c,lab);
     if(choice == 3)
         exit(0);
     return;
}


int main()
{
    int lab[4];
    lab[0] = 5;
    lab[1] = 6;
    lab[2] = 4;
    lab[3] = 3;
    int **labmain;
     labmain = new int*[4];
    for(int i = 0; i <4 ; i++)
    {
            *(labmain + i) = new int;
    }
    labmain = dynArray(4,7);
    int ID,Station,row,r,c,labnumb;
     Menu(labmain,ID,Station,labnumb,row,r,c,lab);
      system("PAUSE");
      return 0;
}

Here is my completing code but still with some mistake and i have tried a few days to debug it but I can't understand where that mistake get wrong

**~Kyo~** · 03-28-2012

Are we storing rows and columns that they are sitting in as well?

**~Kyo~** · 03-28-2012

Code:

C:\Users\David\Desktop\Cboard\eric\main.cpp||In function 'int** dynArray(int, int)':|                   
C:\Users\David\Desktop\Cboard\eric\main.cpp|22|warning: unused variable 'size'|                        You are not using the variable in the function why even declare it?
C:\Users\David\Desktop\Cboard\eric\main.cpp||In function 'void logout(int**, int, int, int*)':|
C:\Users\David\Desktop\Cboard\eric\main.cpp|42|error: 'search' was not declared in this scope|           Search is declared after the function you are using it in you can't do that.
C:\Users\David\Desktop\Cboard\eric\main.cpp|44|warning: pointer to a function used in arithmetic|          A pointer is not a value you want to use in arithmetic a pointer is likely not the same value you want to use
C:\Users\David\Desktop\Cboard\eric\main.cpp|44|warning: pointer to a function used in arithmetic|          Ditto
C:\Users\David\Desktop\Cboard\eric\main.cpp|44|error: assignment of read-only location '*(dynArray + (((unsigned int)r) + ((unsigned int)c)))'|               What is dynArray?  I don't even see it declared unless I am overlooking something.
C:\Users\David\Desktop\Cboard\eric\main.cpp|44|error: cannot convert 'int' to 'int**(int, int)' in assignment|
||=== Build finished: 3 errors, 3 warnings ===|

**erictu** · 03-29-2012

Hm... no really. Because In my search function i have search for the user login and save the position so that when I call function in the logout function it can search and logout the user forgot to logout

**~Kyo~** · 03-29-2012

Code:

void logout(int **Array,int ID,int row,int lab[])
{
     int r,c;
     if(search(**Array,ID,row,r,c,lab))     //Here is my mistake
 
     dynArray[r][c] = 0;                        //this one also.Need some help on debugging or fix it
     cout<< "You have been logged out."<<endl;
    return;
}

when you call search you are not passing your array by using the double ** in the function call. Do keep that in mind.

Code:

dynArray[r][c] = 0;

Umm it is a function what are you trying to do call the function?

Maybe use:

Code:

dynArray(r,c) = 0;

**erictu** · 03-30-2012

I wondering the second part I'm calling the position of the user login in the search function. And it isn't like this dynArray[][]= 0?

Code:

if(search(Array,ID,row,r,c,lab))

It still got the syntax error in no matching function call

**~Kyo~** · 03-30-2012

Move search function declaration above the logout declaration.

**erictu** · 04-01-2012

It still doesn't work. The syntax error said non-value assismentT_T

**iMalc** · 04-01-2012

OH, in that case:
Move the search function declaration above the logout declaration. Then post the updated code and actual copy-and-paste of the error message.

I see lots of new in your program, but no delete. Figure out how and when you are going to delete stuff and you will solve more of your problem.

**erictu** · 04-01-2012

Here is the new code with the non-lvalue in assignment

Code:

#include <iostream>#include <cstdlib>


using namespace std;
void Displaylab(int *lab,int size)
{
    int i;
     for(i = 0; i < size; i++)
     lab[i] = 0;
     lab[i] = -1;
     return;
}
int **dynArray(int row, int cols)
{
    int **myPtr;
    int lab[4];
    myPtr = new int *[row];
    for(int i = 0; i < row; i++)
    myPtr[i] = new int[lab[i]];
    int i = 0;
    int size;
    if(myPtr[i] == 0)
    cout<<"empty";
    return myPtr;   
}


void getinput(int ID,int &Station,int &labnumb)
{
     cout<<"Enter your ID number: "<<endl;
     cin>>ID;
      cout<<"Enter your station number: "<<endl;
     cin>>Station;
      cout<<"Enter your lab number: "<<endl;
     cin>>labnumb;
     return;  
}
void login(int **Array,int ID,int &Station,int &labnumb)
{
     getinput(ID,Station,labnumb);
     Array[labnumb-1][Station-1] = ID;  
     return;
     
}
bool search(int **Array,int ID,int row,int &r,int &c,int lab[])
{
     cout<<"Enter user ID to check: "<<endl;
     cin>>ID;
     bool found = false;
     for(int i = 0; i < row;i++)
     for(int j = 0; j < lab[i];j++)
     if(ID == Array[i][j])
     {
      found = true;
      r = i;
      c = j;
      
      }
     return found;
}     
void logout(int **Array,int ID,int row,int lab[])
{
     int r,c;
     if(search(Array,ID,row,r,c,lab))
     dynArray(r,c) = 0;
     cout<< "You have been logged out."<<endl;
    return;
}


void Menu(int **Array,int ID,int &Station,int &labnumb,int row,int &r,int &c,int lab[])
{
     int choice;
     cout<<"Enter 1 for login, 2 for search,3 for exit. "<<endl;
     cin>>choice;
     if(choice == 1)
         login(Array,ID,Station,labnumb);
     if(choice == 2)
         search(Array,ID,row,r,c,lab);
     if(choice == 3)
         exit(0);
     return;
}


int main()
{
    int lab[4];
    lab[0] = 5;
    lab[1] = 6;
    lab[2] = 4;
    lab[3] = 3;
    int **labmain;
     labmain = new int*[4];
    for(int i = 0; i <4 ; i++)
    {
            *(labmain + i) = new int;
    }
    labmain = dynArray(4,7);
    int ID,Station,row,r,c,labnumb;
     Menu(labmain,ID,Station,labnumb,row,r,c,lab);
      system("PAUSE");
      return 0;
}

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