cin failure

This is a discussion on cin failure within the C++ Programming forums, part of the General Programming Boards category; Code: ... int choice; cin >> choice; ... if i enter no numerical chars a cin error occurs that i ...

  1. #1
    Registered User trekker's Avatar
    Join Date
    Mar 2002
    Posts
    46

    cin failure

    Code:
    ...
    int choice;
    cin >> choice;
    ...
    if i enter no numerical chars a cin error occurs
    that i can't restore with cin.clear()
    i detect the error with cin.fail()

    is it a fatal error?

    TIA
    to boldy code where...

  2. #2
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
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    6,231
    Try something like this one:
    Code:
    #include <iostream> 
    
    int main()
    {
      int i;
      
      std::cout <<"Enter a number" <<std::endl;
      while (!(std::cin>>i))
      {
        std::cout <<"Again:" <<std::endl;
        std::cin.clear();
        while (std::cin.get() != '\n');
      }
    
      std::cout <<"You entered " <<i <<std::endl;
    
    }
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Rad gcn_zelda's Avatar
    Join Date
    Mar 2003
    Posts
    942
    or take out all the std:: and put
    Code:
     using namespace std;
    at the begining

  4. #4
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    Posts
    6,231
    .. and for those interested, you can learn a little more about namespaces here
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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