redirecting input in c++

Question

i was told that to redirect from standard input to file i need to do the following:

static std::ifstream inF("inpur.txt");
std::cin.rdbuf(inF.rdbuf());

and every call to std::cin will be redirected to input.txt. but my question is: do i need to open inF? and if i do, where do i need to do this?

Answer 1

You opened it by calling it with the string constructor.

Answer 2

Your code as-is fine. Do make a backup though of the original cin.rdbuf -- you may need to reset it in case of an error.

Answer 3

That's the beauty. You already did so while declaring the object and passing the string to the explicit constructor of ifstream.

The file is opened in TEXT mode.

Refer this