Switch problem

[Know_Your_Role]

Hi all

Surprised I haven't been able to find a solution to this when it must be a common problem...

I am having trouble with a switch statement that is nested in a forever loop. The user is to input an unsigned short to determine which case the program should jump to. My problem is that if the user inputs a letter instead of a number, the program then keeps looping forever rather than simply going to the default case. Can anyone tell me how to fix this?

Many thanks :-)

John

[anon]

You'll need to check the state of the input stream:

unsigned i;

while (!(cin >> i)) {
    cin.clear(); //clear error status
    cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //discard any unread characters
}
//now i contains input

You might also check if the input error was eof, and break from the infinite loop in this case: may-be the user really wants to stop.