simple c++ file opening issue

#include <iostream>
#include <fstream>
using namespace std;

int main ()
{
  ofstream testfile;
  testfile.open ("test.txt");
  testfile << "success!\n";
  testfile.close();
  return 0;
}

1)called "g++ testfile.cpp"
2)created "test.txt"
3)called "chmod u+x a.out"
4)???
5)file remains blank.

I feel like an idiot for failing at something as trivial as this is supposed to be.

From stackoverflow

• When performing file I/O, you almost always need to test for errors:

  #include <iostream>
  #include <fstream>
  using namespace std;
  
  int main ()
  {
    ofstream testfile;
    testfile.open ("test.txt");
    if ( ! testfile.is_open() ) {
       cerr << "file open failed\n";
       return 1;
    }
  
    if ( ! testfile << "success!\n" ) {
       cerr << "write failed\b";
       return 1;
    }
  
    testfile.close();   // failure unlikely!
    return 0;
  }
  

  Robert : 1) use "(!( testfile << "success!\n" ))" not (! testfile << "success!\n" ) still does nothing. I also tried adding "cout<<"something";" at the start of the main function. I am beginning to believe the problem is not in the executable syntax

  anon : @Robert Good catch. I think your problem is to do with your environment, or your understanding of it, and not with your understanding of C++.

  wilhelmtell : you don't have to close the file. it's on the stack.

• In theory they're equivalent, but just to make sure, do try << endl instead of "\n" to flush the stream.

  ofstream testfile;
  testfile.open ("test.txt");
  testfile << "success!" << endl;
  testfile.close();
  

  GMan : `close()` flushes anyway.