Switch problem

This is a discussion on Switch problem within the C++ Programming forums, part of the General Programming Boards category; Hi all Surprised I haven't been able to find a solution to this when it must be a common problem... ...

  1. #1
    Registered User
    Join Date
    Mar 2009
    Posts
    43

    Switch problem

    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

  2. #2
    The larch
    Join Date
    May 2006
    Posts
    3,573
    You'll need to check the state of the input stream:

    Code:
    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.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

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