if (cin >> day) day; else break;

[mathewji]

With:

int day = 0;
while(true) {
cout << "number: ";
cin >> day }

Inputting anything besides an int into day, causes nonstop output of "number: ". I found a solution as:

int day = 0;
while(true) {
cout << "number: ";
if (cin >> day) day;
else break; }

Anyone know why this happens?

[Marcel Mueller]

On 28.12.14 20.29, mathewji wrote:
> With:
>
> int day = 0;
> while(true) {
> cout << "number: ";
> cin >> day }
>
> Inputting anything besides an int into day, causes nonstop output of "number: ". I found a solution as:

If no int can be read from cin then the >> operator does nothing but
setting an error flag which you did not check.

> int day = 0;
> while(true) {
> cout << "number: ";
> if (cin >> day) day;
> else break; }
>
> Anyone know why this happens?

Now you checked for the error by implicitly converting cin (istream) to
bool.


Marcel

[Barry Schwarz]

When cin encounters a character that cannot be part of the int, it
terminates and leaves that character in the buffer. The next time cin
tries to extract an int, it runs into the same "invalid" character.
Repeat until bored.

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