C ++ Primer Plus 6th Reading Notes, primer6th

C ++ Primer Plus 6th Reading Notes, primer6th
1. Handling line breaks when cin reads errors

1 # include <iostream> 2 3 using namespace std; 4 5 int main () {6 double d; 7 char c; 8 cin> d; 9 if (! Cin) {10 cout <"x" <endl; 11 cin. clear (); 12 cout <cin. get () <endl; 13} 14 // cin. get (); 15 cin. get (c); 16}

The preceding code is entered in two cases:

If the input is double type, cin. get (c) will read the line break and the program is running.

If the input is not double type, such as char type, the cin will set the error bit, retain the incorrect input while discarding the carriage return (this is the case, the cause is guessed), so the program is running to the cin. get (c) stops waiting for input.

It was strange that the program was tested several times again, and it felt like before that, the program was finished.