Segmentation Fault when getting user input

Question

I have this:

    // Get database access parameters 
    const char* db = "codes", *server = "localhost", *user = "root", *pass = "pass";

    // Connect to the sample database.
    mysqlpp::Connection conn(false);
    if (conn.connect(db, server, user, pass)) {

        for (int i=0; i<10; ++i)
        {
            int d, count;
            cout << "Введите D\n";
            cin >> d;
            cout << "Введите количество записей при D=" << d << endl;
            cin >> count;
            for (int a=0; a<count; ++a)
            {
                char * name;
                int r,n1,n2;
                cout << "Введите R\n";
                cin >> r;
                cout <<"Введите n1 и n2\n";
                cin >> n1 >> n2;
                cout <<"Введите название\n";
                cin >> name;
                mysqlpp::Query query = conn.query();
                for (int j=n2-n1+1; j<n2; ++j)
                {
                    int k =pow(2,(j+r));
                    query << "insert into code (n,k,d, name) values (" << j << "," << k << "," <<d<<"," << mysqlpp::quote_only << name << ");";
                    query.execute(); 
                }
            }
        }
        conn.disconnect ();
        return 0;
    }
    else {
        cerr << "DB connection failed: " << conn.error() << endl;
        return 1;
    }
}

Sorry for posting all the code. I can compile the program with no errors, but in command line, it says "Segmentation fault". Whats this error? And how to solve it?

Answer 1

You should allocate space for

char * name;

before writing to it.

If you know that name isn't going to be longer then MAXNAME then just define name to be

char name[MAXNAME+1]

That should solve your problem.