having many value in 1 variable

[yhangel]

im doing this log-in system..

how can possibly username variable has contains many value?

[Max Edgar]

Im not sure I understand

How can a char username; contain many values?

[snipslog]

Do you mean structs?

struct user
{
    string username;
    string password;
};

[chipp]

string many_values;

[Azagaros]

User name can be inputted then validation would need to gathered. The getLine(cin, myString) function can populate the string with a full name.

[packetpirate]

Use an array?

[magadavixt]

hey packetpirate, are you familiar with arrays? i'm having trouble with mine.. do you mind stepping over to my thread and helping me out? :OO http://www.cplusplus.com/forum/beginner/63971/

[yhangel]

what im trying to do is..

username: me

would you like to add username? (y-yes): y

add username:

username: <new username>

now you have 2 username.

[Stewbond]

Yep, make an array of strings.

int main()
{
  string username;
  string storedNames[100];
  int NumNames = 0;
  
  while (true)
  {
    cout << "username: ";
    getline(cin,username);
   
    bool exists = false;
    for (int i = 0; i < storedNames.size(); i++)
      if (storedNames[i] == username)
        exists == true;
   
    if (!exists)
    {
      char test;
      cout << "would you like to add this username? (y/n): ";
      cin >> test;
      if (test == y)
        storedNames[NumNames++] = username;
    }
    else
      cout << "You are logged in" << endl;

    cout << "There are " << NumNames << " usernames" << endl;
  }
}

[packetpirate]

@magadavixt

What's there to help with? They've already given you all the information you need.

[yhangel]

.size() got an error.

[Stewbond]

Make sure to add this line to your file:
#include <string>

[yhangel]

error C2228: left of '.size' must have class/struct/union type

still got this error

[Stewbond]

Oh I see the issue, I was in vector mode there for a second (instead of array mode)

Replace storedNames.size() with 100 (the length of our array)

int main()
{
  string username;
  string storedNames[100];
  int NumNames = 0;
  
  while (true)
  {
    cout << "username: ";
    getline(cin,username);
   
    bool exists = false;
    for (int i = 0; i < 100; i++)
      if (storedNames[i] == username)
        exists == true;
   
    if (!exists)
    {
      char test;
      cout << "would you like to add this username? (y/n): ";
      cin >> test;
      if (test == y)
        storedNames[NumNames++] = username;
    }
    else
      cout << "You are logged in" << endl;

    cout << "There are " << NumNames << " usernames" << endl;
  }
}