C++ Dictionary attack

#include <isotream>
#include <string>
#include <fstream>

void Hash()
{
  string passHash;
  cout <<"Enter in password hash: "<<; std::endl;
  cin>> passHash; std::endl

  return 0;
}
int main()
{
  string fileName;

  cout <<"Enter in File: "<< std::endl;
  cin>>fileName; std::endl;

  int nLine=1;

  cin.getline(fileName);
  passHash=fileName;
}
  while passHash != fileName
{
    nLine++;
    cin.getline(fileName);

	cout<< passHash "=" fileName<<; std::endl;
	return 0;
}