Reading numbers from file, invalid loop state

I read in this way, where file my object of the <ifstream> class, the loop will go into an invalid state, if I catch the symbol, how to read everything from the file that matches the type, and not get a stake?

  int n, count = 0; while (file >> n) { ++count; } 

Py.Sy. If the number in the file is larger than the size of the inta, how to get around it? That is also not read.