#include <stdlib.h>  #include <time.h>  #include <windows.h>  #include <stdio.h>  typedef struct node  {      int h;      int m;      int s;  }  *PTime;  void sleep(long wait);  void gettime();  int main()  {      PTime times;      int flag = 1;      char time[128];      do      {          _strtime(time); // Gets the current system time (do not include the date)          system("cls"); // clear screen          printf("OS time: %s\n",time);          gettime(times); // call gettime()          sleep(1000); // sleep 1 second          printf("已开机时间: d小时d分d秒\n", times->h, times->m, times->s);      }while(flag); // always cycle      return 0;  }  void sleep(long wait)  {      long goal; // define total time      goal = wait + clock();      while(goal > clock());  }  PTime gettime(PTime T)  {      int i = GetTickCount();      T->h = (i / 1000) / 3600;      T->m = (i / 1000) / 60 - T->h * 60;      T->s = (i / 1000) - T->h * 3600 - T->m * 60;      return T;  }