Basic password authentication system app

This is a console app I wrote for an end-of-chapter assignment in Jumping into C++. The parameters were for it to have a basic password system, and if you are eager, a multiple password / username system. I am going through this book completely on my own free will. It's not through a school assignment or whatnot.

It works quite well, but as I have a limited programming background, I wanted to post it here so any bad techniques or poor syntax could be brought to my attention.

#include 

using namespace std;

string usrnam[] = { "admin", "user", "" };
string pasword[] = { "root", "default", ""};

string temp_pass;
string temp_usr;

bool loggedin;

int n = sizeof(usrnam) / sizeof(string);

int findPassword( string str[], int array_size, string query )
{
    for ( int i = 0; i > stage;
    switch(stage)
{
    case 1: {
        cout > answer;
    if (answer == "y" || answer == "Y")
    {
        cout > usrnam[n-1];
        cout > pasword[n-1];

        login(usrnam[n-1],pasword[n-1]);
    }
}

int main()
{
    cout > temp_usr;
    cout > temp_pass;

    login(temp_usr,temp_pass);

    if(!loggedin)
        registerUser();
}

-
Try using std::vector instead of arrays. As a result, you'll not be required to keep track of the array_size in a separate variable like n in your case.

Something like this:

std::vector username;
username.push_back("admin");
//other entries go here
std::vector password;
password.push_back("root");
//other entries go here

Then, the size of the std::vector is given by size().

-
Try to use proper names as variables. Avoid wrong spellings or short-names. Exact variable names make the code easy to understand, as the name represents the actual concept the variable is referring to.

-
Also, in registerUser() the variable answer can just be a char. This will help in saving a little memory.
Like:

char answer;
std::cin>>answer;
if(answer=='y' || answer=='Y')
{
    //code goes here
}

-
In your code, the method commandC() is defined to return an int. But it doesn't do so. Make the return type void instead.

void CommandC()
{
    //code goes here
}

-
Also, the main() method is defined to return an int too. It is a good practice to declare it like that, but make sure to return an integer. 0 (zero) is preferred as it refers to successful completion of main().

int main()
{
    //code goes here
    return 0; //indicates successful termination
}

StackExchange Code Review Q#37235, answer score: 14