detecting end of input with cin

Question

I want to read a line of integers from the user. I\'m not sure how to check to see if the input has ended. For example I want to be able to do something like

Answer 1

using fstream you can do something like this

ifstream ifile("input.txt");
while(!ifile.eof())
{
    /* do something */
}

you can also use this

if(!ifile.is_open())
{
   /* do something */
}