verifying user input

[rssmps]

	
nt x;
displayMainMenu();
cin >>x;
while (!cin)
{
    cin.clear();
    cin.ignore(100,'\n');
    displayMainMenu();
    cin >>x;
}

Ok, the way I have it, if I type in any string such as 12A, the number 12 will be read in to x. If it's 9.A, it will read 9. This only works if the number is in front. If I type A9, it is an error and redisplays the menu.

how do I make sure input like this is not considered good?

Thanks!

[Danny]

The best practice is to read the input into a string and then validate it: http://www.devx.com/getHelpOn/10MinuteSolution/16975
It's nearly impssible to teach cin what constitutes valid input, especially when you expect alphanumeric data. Simply read the string and then go through each character to decide if it's good or not.