C + + Primer Plus 6th reading notes-6th branch statements and logical operators

1. The handling of line breaks when Cin reads errors

1#include <iostream>2 3 using namespacestd;4 5 intMain () {6     DoubleD;7     CharC;8CIN >>D;9     if(!cin) {Tencout <<"x"<<Endl; One cin.clear (); Acout << cin.Get() <<Endl; -     } -     //cin.get (); theCin.Get(c); -}

The above code input is divided into 2 cases:

If the input is a double type, cin.get (c) reads the newline character and the program finishes running.

If the input is not a double type, such as the char type, then CIN will place the wrong bit, leaving the wrong input with the return character (this is why, guess), so the program stops waiting for input when it runs to Cin.get (c).

Strange, and tested several times, feeling the same as before, the program runs the end.

C + + Primer Plus 6th reading notes-6th branch statements and logical operators