No match for 'operator>>'in 'std::operator

[Alehar]

Hi, Im creating a simple program but i cant compile because it gives me that error.

#include <iostream>
#include <fstream>

using namespace std;

int main ()
{
    ofstream users;
    users.open ("database.txt");
    
    string user[20], password[16], password2[16];
    
    cout << "Enter your username";
    cin >> usuario >> endl;
    
    users >> usuario;
    
    cout << "Enter your password" << endl;
    cin >> password ;
    cout << "Repite your password" << endl;
    cin >> password2 ;
    
    if (password & password2)
    {
                 users >> password;
                 }
                 else 
                 {
                      cout << "Sorry your password's are not the same, try again!";
                      }
                      
}
    

Thank you, and sorry for my english.

[ResidentBiscuit]

Because std::ofstream has no operator>> :)
std::ofstream has operator<<

http://www.cplusplus.com/reference/fstream/ofstream/

[Alehar]

So, is ifstream users?

Because i want write on it.

[LB]

std::ofstream is for writing to a file.
std::ifstream is for reading from a file.

[giblit]

Also look at line 14. You are trying to input to endl;?

[Alehar]

I correct the endl;
But i dont understand why my file give error another time
So is okay with ofstream, ty.

[LB]

>> is for reading in data.
<< is for writing out data.

[ne555]

If you don't understand the error message, ¿why did you remove information from it? (as it is, we can't know which objects is referring to, or what line is it happening)
I realize that the message is quite lengthy, so send it to a file and upload that.

You may want to take a look at those lines that say `error'

g++ foo.cpp 2>&1 | grep error
foo.cpp:14:9: error: ‘usuario’ was not declared in this scope
foo.cpp:19:6: error: no match for ‘operator>>’ in ‘std::cin >> password’ (operand types are ‘std::istream {aka std::basic_istream<char>}’ and ‘std::string [16] {aka std::basic_string<char> [16]}’)
foo.cpp:21:6: error: no match for ‘operator>>’ in ‘std::cin >> password2’ (operand types are ‘std::istream {aka std::basic_istream<char>}’ and ‘std::string [16] {aka std::basic_string<char> [16]}’)
foo.cpp:23:17: error: invalid operands of types ‘std::string [16] {aka std::basic_string<char> [16]}’ and ‘std::string [16] {aka std::basic_string<char> [16]}’ to binary ‘operator&’
foo.cpp:25:9: error: no match for ‘operator>>’ in ‘users >> password’ (operand types are ‘std::ofstream {aka std::basic_ofstream<char>}’ and ‘std::string [16] {aka std::basic_string<char> [16]}’)

14: trying to use a non-existent variable

19,21: trying to read an array. Probably you intended to write

std::string usuario, password, password2;
std::cin >> usuario;
std::cin >> password;
std::cin >> password2;

note that the length of the strings is not limited

23: don't guess the syntax. I suppose that you want to compare the strings, so if( password == password2 ) provided that you made the previous change

25: what ResidentBiscuit said users << password, the same applies to line 16.


Also, learn to indent.
Or better, don't. Simply let your IDE to handle that.


Edit:
output to file stream -> ofstream
input from file stream -> ifstream