Not sure why this won't work

[Kieth89]

It goes into the loop, so I think that the problem is my conditional operator. Can I not use function calls in it? Here is the code:

#include <iostream>
#include <cctype>

int main()
{
	using std::cout;
	using std::cin;
	char ch;
	cin.get(ch);
	while (ch != '@')
	{
		if (!(isdigit(ch) && isxdigit(ch)))
		{
			if (isalpha(ch))
				isupper(ch) ? tolower(ch) : toupper(ch);  //Think problem is here, it goes into the second
                                                                                     // if correctly, but it doesn't seem to do this part.
			cout << ch;
		}
		cin.get(ch);
	}
	return 0;
}

Any help would be appreciated. I'm sure its something simple that I'm overlooking.

EDIT: telling you what the program is meant to do might help. It is supposed read keyboard input to the @ symbol, echo that input excluding digits, also converting each uppercase character to lower and vice versa. Its that last part that is proving difficult.

[rocketboy9000]

if(isalpha(ch)) ch = (isupper(ch) ? tolower(ch) : toupper(ch));

[Kieth89]

oh. Yeah, that might make a difference. thanks. _{*walks away feeling one point dumber*}