Function not returning right?

The problem here is that I get a prompt returning 0 0 Press any key to continue. instead of 0 333 Press blah blah

class TestClass
{
public:
	int	TestNum;
};

vector<TestClass> TC(5);

TestClass TestFunction()
{
	return TC[0];
}

void main()
{
	TC[0].TestNum = 0;
	cout << TC[0].TestNum << endl;
	TestFunction().TestNum = 333;
	cout << TC[0].TestNum << endl;
}

Though, if I replace TestFunction.TestNum = 333; with TC[0].TestNum = 333;, it works. Though, I dont want to use that... or else, I wouldn''t be testing this.

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