I get an error on line 19 in this code. The error is "C2228: left of '.tm_sec' must have class/struct/union type"

Code:
#include "stdafx.h"
#include <iostream.h>
#include "string.h"
#include "time.h"

int main()
{
	tm * x;
	int sec;
		
	while (1==1)
	{
	
		_getsystime(x);
		
		sec=x.tm_sec;
		cout<<sec;
	}

	return 0;
}
What's wrong?