cin.fail() function

This is a discussion on cin.fail() function within the C++ Programming forums, part of the General Programming Boards category; Ill throw my code at you first Code: int menu(int &answer) { do { cout << "----Menu----" << endl << ...

  1. #1
    -
    Join Date
    Feb 2003
    Posts
    47

    cin.fail() function

    Ill throw my code at you first

    Code:
    int menu(int &answer)
    {
        do {
            cout << "----Menu----"  << endl
                 << "1 something"   << endl
                 << "2 something"   << endl
                 << "3 something"   << endl
                 << "Please select an option (1, 2, or 3): ";
            cin >> answer;
            
            if (( cin.fail() ) == 1) {
                    cin.clear();
                    cout << "Please enter a valid option" << endl;
            }
            else if ((answer != 1) && (answer != 2) && (answer != 3)) {
                    cout << "Please enter a valid option" << endl;
            
            }
        } while ( (answer != 1) && (answer != 2) && (answer != 3) );
        
    return answer;
    }
    now it seems to handle most error type inputs except if u enter a character and i thought cin.fail and what i have done might be able to deal with it but it doen't, Have i used the function wrong? And if so could i have some help in correcting it. thanks.

  2. #2
    Registered User
    Join Date
    Mar 2002
    Posts
    1,595
    It's messy, but you could try something like this:
    Code:
    bool Int = false;
    bool validInt = false;
     
    while(!Int && !validInt)
    {
    cin >> answer;
    if(cin.fail())
    {
    	 cin.clear();
    	 cin.ignore(10000, '\n');
    	 cout << "you didn't enter an integer" << endl;
    	 cout << "Please enter a valid option" << endl;
    }
    else if((answer < 1) || (answer > 3)) 
    {
    	cout << "the int must be 1, 2, or 3" << endl;
    	cout << "Please enter a valid option" << endl;
    } 
    else
    {
    	 Int = true;
    	 validInt = true;
    }	 
    }
    Last edited by elad; 04-26-2004 at 02:20 PM.

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