I know there's one in Visual Basic, but is there a function to verify that input is actually an integer in Visual C++.

IsInt ( variable )

Returns 1 if true, 0 if not.

If he's trying to protect cin from getting slaughtered that's not going to help. If you try to cin an int and somebody puts a character string in there, cin will asplode.

Try this:

while (!cin>>IntegerVariable)
{
cout << "That's not an integer" << endl;
cin.clear();
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
}
cout << "You entered the integer " << IntegerVariable << endl;

EDIT: If you're trying to "protect" an edit box in MFC, right click the edit box, go to the "Styles" tab and check "Number".

Awesome, thanks zKissane. It'd be helpful if we learned these things in class, but oh well.