Testing for Extraction Errors
Visual C++ in Visual Studio 2015
The latest version of this topic can be found at Testing for Extraction Errors.
Output error processing functions, discussed in Error Processing Functions, apply to input streams. Testing for errors during extraction is important. Consider this statement:
cin>> n;
If n is a signed integer, a value greater than 32,767 (the maximum allowed value, or MAX_INT) sets the stream's fail bit, and the cin object becomes unusable. All subsequent extractions result in an immediate return with no value stored.