What will be the output of the following C++ code?

#include <iostream>
#include <fstream>
using namespace std;
int main () 
{
    int length;
    char * buffer;
    ifstream is;
    is.open ("sample.txt", ios :: binary );
    is.seekg (0, ios :: end);
    length = is.tellg();
    is.seekg (0, ios :: beg);
    buffer = new char [length];
    is.read (buffer, length);
    is.close();
    cout.write (buffer, length);
    delete[] buffer;
    return 0;
}