Error checking

[muffsez]

Hello, I have a quick snipet of code I'm writing currently:

cout << "What is your first number?" << endl;
	cin >> fNum;
	cout << "What is your second number?" << endl;
	cin >> sNum;
	
	while (fNum >= sNum) { //Check user input

		cin.ignore(256, '\n');
		cin.clear();
		cout << "Invalid input, first number must be less than second" << endl;
		cout << "What is your first number?" << endl;
		cin >> fNum;
		cout << "What is your second number?" << endl;
		cin >> sNum;
		cout << sNum;
	}

What I'm trying to do here is make it so that if when prompted for a user's first number and they were to enter in 20 10 then I would want to clear the white space, and then the 10. As of now if I enter in 20 10 it will store 20 for fNum and then 10 for sNum. I was looking at regex, but that doesn't seem to fit what I'm attempting to do. Any ideas? I've been stumped on this for a day or so playing around with cin.clear() and what not.

Thank you.

[muffsez]

It actually just dawned on me, adding in cin.ignore(256, '\n'); after I cin for my values fixes it.