"Cant read memory" error

This code works but retuns an error saying:
The instruction at "0x6f746172" referenced memory at "0x6f746172". The memory could not be "read".
(this error seems to occur at the very end of the code).

Code:

---

#include <windows.h>
#include <stdio.h>

int main()
{
        char s_username;
        unsigned long i_length;
        GetUserName (&s_username, &i_length);
        printf(&s_username);
        return 0;
}

---

Why is that?

It does not give me any error in vc++ but when I run it, it gives me some weird characters as the username:eek:

grrr....very weird...

I get: "Administrator" *error occurs here* "Press any key to exit"

You need to use a buffer:

Code:

---

#include <windows.h>
#include <stdio.h>

int main() {
    char pcUserName[100];
    unsigned long lLength = 100;
    GetUserName(pcUserName, &lLength);
    printf("%s\n", pcUsername);
    return 0;
}

---

Thank you VERY much :)