C++ having cin read a return character

Question

I was wondering how to use cin so that if the user does not enter in any value and just pushes ENTER that cin will recognize this as valid

Answer 1

To detect the user pressing the Enter Key rather than entering an integer:

char c;
int num;

cin.get(c);               // get a single character
if (c == 10) return 0;    // 10 = ascii linefeed (Enter Key) so exit
else cin.putback(c);      // else put the character back
cin >> num;               // get user input as expected

Alternatively:

char c;
int num;
c = cin.peek();           // read next character without extracting it
if (c == '\n') return 0;  // linefeed (Enter Key) so exit
cin >> num;               // get user input as expected