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

int main()
{
	int h = 0;
	int m = 0;
	int s = 0;
	int t = 0;//存儲time函數的返回值
	while(1){
		t = time(0);//取得當前的時間（秒的總和）
		//將t拆分為時分秒
		s = t%60;
		m = t%3600/60;
		h = (t%(24*3600)/3600 + 8)%24;//東8區
		printf("%02d:%02d:%02d\r", h, m, s);
		fflush(stdout);
		while(t == time(0));//等待這一秒過去
	}

	return 0;
}

2、猜數字遊戲

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

int main()
{
    int data = 0;
    int count = 0;
    srand(time(0));
    data = rand()%100;
    printf("猜數遊戲：（0～100）\n");
    while(1){
        int t = 0;
        printf("請輸入猜想數:");
        count++;
        scanf("%d", &t);
        if(t>data){
            printf("太大了\n");
        }else if(t<data){
            printf("太小了");
        }else{
            break;
        }
    }
    printf("猜對了。\n");
    printf("count = %d\n", count);
    return 0;
}