C语言显示当前时间

#include<stdio.h>
#include<Windows.h>
#include<time.h>

struct clock {
	int hour;
	int minute;
	int second;
};

typedef struct clock CLOCK;

int main()
{
	CLOCK t = { 0,0,0 };
	int n = 100, i = 0;
	char c;
	time_t now;
	struct tm local;
	while (1)
	{
		time(&now);
		localtime_s(&local, &now);
		printf("%2d:%2d:%2d\r", local.tm_hour, local.tm_min, local.tm_sec);
	}
	/*
	while (i++<n)
	{
		t.second++;
		if (t.second >= 60) {
			t.second = 0;
			t.minute++;
		}
		if (t.minute >= 60) {
			t.minute = 0;
			t.hour++;
		}
		if (t.hour >= 24)
			t.hour = 0;
		printf("%2d:%2d:%2d\r", t.hour, t.minute, t.second);
		Sleep(1000);
	}
	*/

}