linuxÏÂcÓïÑԹػú³ÌÐò
/* Offtimer.c.For auto halt. */
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#define DELAY 60/* Time of sleeping */
int main()
{
time_t now;
struct tm *p;
while(1)
{
now = time(NULL);
sleep(DELAY);/* To reduce cpu occupation */
p = localtime(&now);
if ((p->tm_hour = 14) && (p->tm_min >= 30))/ *This means the system will halt after 14:30 or 14:31 */
system("poweroff"); / *'poweroff' is the command in Red Flag Linux
Desktop 5.0 to turn off the computer.To do this you should be root. */
}
return 0;
}
ÒýÓÃgcc±àÒ룬ÁíÍâÐèÒªÓÐrootÓû§µÄȨÀû²ÅÄÜÐС£
Ïà¹ØÎĵµ£º
ÐźÅÖ¸¶¨´¦Àíº¯Êý
void (*signal (int signum,void (*handle)(int)))(int);ÉèÖÃij¸öÐźŵĴ¦Àí·½·¨
int sigaction(int signum,const struct sigaction *act,struct sigaction *oldact);ÓÃÓÚ¼ì²é»ò¸Ä±ä½ø³ÌÔÚ½Óµ½ÐźÅʱµÄ¶¯×÷
Ðźż¯²Ù×÷º¯Êý
static inline void sigaddset(sigset_t *set,int _sig);
static inline voi ......
·Ç³£»ù±¾¹ØÓÚCÓïÑÔµÄÎÊÌâ,Ò»¸öÐÅÏ¢Àà(¼ÆËã»ú,×ÊѶ¹¤³Ì,µç×Ó¹¤³Ì, ͨÐŹ¤³Ì)רҵµÄ±¾¿Æ±ÏÒµÉúÓ¦¸Ã´ïµ½µÄˮƽ¡£ÌâÄ¿²»ÄÑ,È«²¿¶¼ÄÜ¿ìËٵشðÍ꣬µ±È»Ò²ÐèÒªÒ»¶¨µÄ֪ʶ´¢±¸¡£
¶ÔÓÚ´ó¶àÊýÈË£¬ÎÒÃÇÔ¤ÆÚÄã¿ÉÄÜ´ð´í 3) 4) 15)Ì⣬ËùÒÔ´ð´í3µÀÒÔÄڵģ¬ÎÒÃÇÈÏΪÄãºÜ°ô
´ð´í5µÀÌâÒÔÄÚ£¬ÎÒÃÇÈÏΪÄ㻹²»´í(Ä㻹¿ÉÄÜ´ð ......
Ïêϸ²Î¿¼´ð°¸
µÚ1Ìâ: (b)
volatile×ÖÃæÒâ˼ÊÇÒ×ÓÚ»Ó·¢µÄ¡£Õâ¸ö¹Ø¼ü×ÖÀ´ÃèÊöÒ»¸ö±äÁ¿Ê±£¬Òâζ×Å ¸ø¸Ã±äÁ¿¸³Öµ(дÈë)Ö®ºó£¬ÂíÉÏÔÙ¶ÁÈ¡£¬Ð´ÈëµÄÖµÓë¶ÁÈ¡µÄÖµ¿ÉÄܲ»Ò»Ñù,ËùÒÔ˵Ëü"ÈÝÒ×»Ó·¢"µÄ¡£
ÕâÊÇÒòΪÕâ¸ö±äÁ¿¿ÉÄÜÒ»¸ö¼Ä´æÆ÷£¬Ö±½ÓÓëÍⲿÉ豸ÏàÁ¬£¬ÄãдÈëÖ®ºó£¬¸Ã¼Ä´æÆ÷Ò²ÓпÉÄܱ»ÍⲿÉ豸µÄд²Ù×÷Ëù¸Ä±ä;»òÕ ......
MYSQLÔÚ C API ÖпÉÓõĺ¯Êý£º
mysql_affected_rows()
·µ»Ø±»×îеÄUPDATE, DELETE»òINSERT²éѯӰÏìµÄÐÐÊý¡£
mysql_close()
¹Ø±ÕÒ»¸ö·þÎñÆ÷Á¬½Ó¡£
mysql_connect()
Á¬½ÓÒ»¸öMySQL·þÎñÆ÷¡£¸Ãº¯Êý²»ÍƼö£»Ê¹ÓÃmysql_real_connect()´úÌæ¡£
mysql_change_user()
¸Ä±äÔÚÒ»¸ö´ò¿ªµÄÁ¬½ÓÉϵÄÓû§ºÍÊý¾Ý¿â¡£
mysql_ ......
#include <Windows.h>
#include <math.h>
#include "resource.h"
#define PI 3.1415976/180
int dwCenterX,dwCenterY,dwRadius;
const TCHAR *szAppName=TEXT("Clock");
LRESULT CALLBACK ProcWinMain(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
void ShowTime(HWND hwnd,HDC hdc);
void ......