! file.eof () what happens at the last iteration? [duplicate]

Question

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Good evening. Tell me why this code:

while (!file.eof()) { file >> p1.x >> p1.y; MyVector.push_back(p1); cout << p1.x << " " << p1.y<<endl; }

With this information in the file:

 0 0 0 10 10 10 10 0

Displays the following:

 0 0 0 10 10 10 10 0 10 0

and accordingly the size of the vector will be equal to 5?

PS need to get around this moment

Accepted Answer · 2017-11-22T17:48:08

Do not do this: while (!file.eof())

This check will work only after unsuccessful reading past the end of the file.

And here you are

 file >> p1.x >> p1.y; MyVector.push_back(p1);

Good luck reading do not check ...

Well, since @ixSci insists ... [Mentor tone] - should be like this:

 while (file >> p1.x >> p1.y) { MyVector.push_back(p1); cout << p1.x << " " << p1.y<<endl; }

Including file availability using #include <experimental/filesystem> and !is_regular_file(filename)
So you show the person how to correctly, what did the problem just describe?
@ixSci Man, as you see, rests with his legs and hands ... And then - I actually wrote - to check the success of reading - is this not enough?

Reported as a duplicate member by VladD c ++ Participants with Signs Nov 22 '17 at 6:05 pm