Programming

#include <pwd.h>
#include <iostream>
#include <string.h>
using namespace std;
int main()
{
    struct passwd *user;
    char login[200]="alex", password[200]="qwertyuiop";

       if ((user= getpwnam(login)) == NULL)
            cout << "No such user\n";
       else if (!strcmp(user->pw_passwd, crypt(password, user->pw_passwd)))
            cout << "Password correct\n";
       else
            cout << "Password incorrect\n";
    return 0;
}

The crypt() function performs password encryption, based on the NBS Data Encryption Standard (DES).
Additional code has been added to deter key search attempts

1./home/alex/Qt/libtest/main.cpp:12: undefined reference to `crypt'
2.:-1: error: collect2: ld returned 1 exit status