How to fix arguments and operators error, and can i outfile vector?

Question

i'm new to all this coding stuff. So i'm trying to comparing some accounts names and these errors poped up: no instance of overloaded function getline matches the argument list, and no operator"<<" matches the operands. Please explain, thanks a lot.

#include<iostream>
#include<fstream>
#include<vector>
#include<string>
 using namespace std;
 int main()
 {
    ifstream inFile("test.txt");
    if (!inFile)
 {
    cout << "Cannot open file.";
    exit(1);
 }
 string input;
 vector<string> tennguoikhac;
 vector<string> tennguoidung;
 cin >> input;
 tennguoidung.push_back(input);
 while (inFile)
 {
    inFile.getline(tennguoikhac);

    if (tennguoikhac == tennguoidung)
    {
        cout << "ten da co nguoi dung" << endl;
    }
}
ofstream outFile("test.txt");
if (!outFile)
{
    cout << "Cannot open file.";
    exit(1);
}
outFile << tennguoidung << endl;
outFile.close();
inFile.close();
return 0;
}

Answer 1

You cannot do getline into vector. What you want is:

std::string tennguoikhacString;
std::getline(std::cin, tennguoikhacString);
std::istringstream tennguoikhacStream(tennguoikhacString);
std::copy(std::istream_iterator<std::string>(std::cin), std::istream_iterator<std::string>(), std::back_inserter<>(tennguoikhac));

You also cannot directly print the vector:

outFile << tennguoidung << endl;

The closest you may want:

std::copy(tennguoidung.cbegin(), tennguoidung.cend(), std::ostream_iterator<std::string>(std::cout, " "));