How to read a file without doing any operation on it.

Question

I just want to read a file and print it on the screen.

Answer 1

Without doing any operation on it? I'm not sure that's possible. Even double-clicking on a file to open it and read it via the OS is still an operation.

http://www.cplusplus.com/doc/tutorial/files/

// reading a text file
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main () {
string line;
ifstream myfile ("example.txt");
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
cout << line << '\n';
}
myfile.close();
}

else cout << "Unable to open file";

return 0;
}

Answer 2

Not changing is best achieved with an ifstream.