Solved

passwords

Posted on 1998-12-03
2
187 Views
Last Modified: 2010-04-02
HeLp PleeZ...
I'm supposed to create a password (but I've already figured that part out because it could be hard coded; that is, all the passwords are made before hand, no new passwords will  be made during the running of the program, though if U have a suggestion of how to do that, I wouldn't mind the tip at all).  The problem is that I have NO idea of how U would go about finding the matching password.  Say for example, the user types in a random number as his password, the next step would be for the program to look if there are any matches....and that's where my problem comes in...how could I go about creating my program to look for matches??
0
Comment
Question by:Marian111998
2 Comments
 
LVL 12

Accepted Solution

by:
rwilson032697 earned 20 total points
ID: 1179153
Suppose your passwords were stored in an array

char *Passwords[MAXPASSWORDS];

Then to find if a password matches the known ones you could do this:

int FindPassword(char *ThePassword)
{
  int i;

  for (i = 0; i < NumPasswords; i++)
  {
    if strcmp(ThePassword, Passwords[i])
    {
      return TRUE;
    }
  }

  return FALSE;
}

You can trivially alter this code to use any data structure you please to hold the passwords...

Cheers,

Raymond.

0
 
LVL 11

Expert Comment

by:alexo
ID: 1179154
[Beat by Raymond, submitting as comment]

If you want to keep the passwords as plain text, you can use something like:

    int match(char* string)
    {
        static char* passwords[] = { "first", "second", "third" };
        int i;

        for (i = 0; i < sizeof(passwords) / sizeof(*passwords); ++i)
            if (strcmp(string, passwords[i]) == 0)
                return 1; /* found a match */

        return 0; /* no match found */
    }

If you want to keep the passwords encrypted, first encrypt the string and then call the match() function.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In days of old, returning something by value from a function in C++ was necessarily avoided because it would, invariably, involve one or even two copies of the object being created and potentially costly calls to a copy-constructor and destructor. A…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question