cin.fail() function

**robid1** · 04-26-2004

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.

**elad** · 04-26-2004

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;
}	 
}

Thread: cin.fail() function

Thread Tools

Search Thread

Display

cin.fail() function

Similar Threads

Compiling sample DarkGDK Program

Seg Fault in Compare Function

Another syntax error

Including lib in a lib

Dikumud