Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

C/C++ÖеÄÈÕÆÚºÍʱ¼ä time_tÓëstruct tmת»»

 ÕªÒª£º
±¾ÎÄ´Ó½éÉÜ»ù´¡¸ÅÄîÈëÊÖ£¬Ì½ÌÖÁËÔÚC/C++ÖжÔÈÕÆÚºÍʱ¼ä²Ù×÷ËùÓõ½µÄÊý¾Ý½á¹¹ºÍº¯Êý£¬²¢¶Ô¼Æʱ¡¢Ê±¼äµÄ»ñÈ¡¡¢Ê±¼äµÄ¼ÆËãºÍÏÔʾ¸ñʽµÈ·½Ãæ½øÐÐÁ˲ûÊö¡£±¾ÎÄ»¹Í¨¹ý´óÁ¿µÄʵÀýÏòÄãչʾÁËtime.hÍ·ÎļþÖÐÉùÃ÷µÄ¸÷ÖÖº¯ÊýºÍÊý¾Ý½á¹¹µÄÏêϸʹÓ÷½·¨¡£
¹Ø¼ü×Ö£ºUTC£¨ÊÀ½ç±ê׼ʱ¼ä£©£¬Calendar Time£¨ÈÕÀúʱ¼ä£©£¬epoch£¨Ê±¼äµã£©£¬clock tick£¨Ê±ÖÓ¼Æʱµ¥Ôª£©
1£®¸ÅÄî
ÔÚC/C++ÖУ¬¶Ô×Ö·û´®µÄ²Ù×÷ÓкܶàÖµµÃ×¢ÒâµÄÎÊÌ⣬ͬÑù£¬C/C++¶Ôʱ¼äµÄ²Ù×÷Ò²ÓÐÐí¶àÖµµÃ´ó¼Ò×¢ÒâµÄµØ·½¡£×î½ü£¬ÔÚ¼¼ÊõȺÖÐÓкܶàÍøÓÑÒ²¶à´ÎÎʵ½¹ýC++ÓïÑÔÖжÔʱ¼äµÄ²Ù×÷¡¢»ñÈ¡ºÍÏÔʾµÈµÈµÄÎÊÌâ¡£ÏÂÃ棬ÔÚÕâƪÎÄÕÂÖУ¬±ÊÕß½«Ö÷Òª½éÉÜÔÚC/C++ÖÐʱ¼äºÍÈÕÆÚµÄʹÓ÷½·¨.
ͨ¹ýѧϰÐí¶àC/C++¿â£¬Äã¿ÉÒÔÓкܶà²Ù×÷¡¢Ê¹ÓÃʱ¼äµÄ·½·¨¡£µ«ÔÚÕâ֮ǰÄãÐèÒªÁ˽âһЩ“ʱ¼ä”ºÍ“ÈÕÆÚ”µÄ¸ÅÄÖ÷ÒªÓÐÒÔϼ¸¸ö£º
Coordinated Universal Time£¨UTC£©£ºÐ­µ÷ÊÀ½çʱ£¬ÓÖ³ÆΪÊÀ½ç±ê׼ʱ¼ä£¬Ò²¾ÍÊÇ´ó¼ÒËùÊìÖªµÄ¸ñÁÖÍþÖαê׼ʱ¼ä£¨Greenwich Mean Time£¬GMT£©¡£±ÈÈ磬ÖйúÄڵصÄʱ¼äÓëUTCµÄʱ²îΪ+8£¬Ò²¾ÍÊÇUTC+8¡£ÃÀ¹úÊÇUTC-5¡£
Calendar Time£ºÈÕÀúʱ¼ä£¬ÊÇÓÓ´ÓÒ»¸ö±ê׼ʱ¼äµãµ½´ËʱµÄʱ¼ä¾­¹ýµÄÃëÊý”À´±íʾµÄʱ¼ä¡£Õâ¸ö±ê׼ʱ¼äµã¶Ô²»Í¬µÄ±àÒëÆ÷À´Ëµ»áÓÐËù²»Í¬£¬µ«¶ÔÒ»¸ö±àÒëϵͳÀ´Ëµ£¬Õâ¸ö±ê׼ʱ¼äµãÊDz»±äµÄ£¬¸Ã±àÒëϵͳÖеÄʱ¼ä¶ÔÓ¦µÄÈÕÀúʱ¼ä¶¼Í¨¹ý¸Ã±ê׼ʱ¼äµãÀ´ºâÁ¿£¬ËùÒÔ¿ÉÒÔ˵ÈÕÀúʱ¼äÊÇ“Ïà¶Ôʱ¼ä”£¬µ«ÊÇÎÞÂÛÄãÔÚÄÄÒ»¸öʱÇø£¬ÔÚͬһʱ¿Ì¶Ôͬһ¸ö±ê׼ʱ¼äµãÀ´Ëµ£¬ÈÕÀúʱ¼ä¶¼ÊÇÒ»ÑùµÄ¡£
epoch£ºÊ±¼äµã¡£Ê±¼äµãÔÚ±ê×¼C/C++ÖÐÊÇÒ»¸öÕûÊý£¬ËüÓôËʱµÄʱ¼äºÍ±ê׼ʱ¼äµãÏà²îµÄÃëÊý£¨¼´ÈÕÀúʱ¼ä£©À´±íʾ¡£
clock tick£ºÊ±ÖÓ¼Æʱµ¥Ôª£¨¶ø²»°ÑËü½Ð×öʱÖӵδð´ÎÊý£©£¬Ò»¸öʱÖÓ¼Æʱµ¥ÔªµÄʱ¼ä³¤¶ÌÊÇÓÉCPU¿ØÖƵġ£Ò»¸öclock tick²»ÊÇCPUµÄÒ»¸öʱÖÓÖÜÆÚ£¬¶øÊÇC/C++µÄÒ»¸ö»ù±¾¼Æʱµ¥Î»¡£
ÎÒÃÇ¿ÉÒÔʹÓÃANSI±ê×¼¿âÖеÄtime.hÍ·Îļþ¡£Õâ¸öÍ·ÎļþÖж¨ÒåµÄʱ¼äºÍÈÕÆÚËùʹÓõķ½·¨£¬ÎÞÂÛÊÇÔڽṹ¶¨Ò壬»¹ÊÇÃüÃû£¬¶¼¾ßÓÐÃ÷ÏÔµÄCÓïÑÔ·ç¸ñ¡£ÏÂÃ棬ÎÒ½«ËµÃ÷ÔÚC/C++ÖÐÔõÑùʹÓÃÈÕÆÚµÄʱ¼ä¹¦ÄÜ¡£
2£® ¼Æʱ
C/C++ÖеļÆʱº¯ÊýÊÇclock()£¬¶øÓëÆäÏà¹ØµÄÊý¾ÝÀàÐÍÊÇclock_t¡£ÔÚMSDNÖУ¬²éµÃ¶Ôclockº¯Êý¶¨ÒåÈçÏ£º
clock_t clock( void );
Õâ¸öº¯Êý·µ»Ø´Ó“¿ªÆôÕâ¸ö³ÌÐò½ø³Ì”µ½“³ÌÐòÖе÷ÓÃclock()º¯Êý”ʱ֮¼äµÄCPUʱÖÓ¼Æʱµ¥Ôª£¨clock tick£


Ïà¹ØÎĵµ£º

[ÊÕ²Ø]C/C++Êý×éÃûÓëÖ¸ÕëÇø±ðÉî²ã̽Ë÷

¸ù±¾Ô­ÒòÔÚÓë×óÖµºÍÓÒÖµ
char a[10]=“hello”;
sizeof(a);//Êý×éÃû×ö×óÖµ£¬¾ßÓÐÊý×éÃûµÄÊôÐÔ£¬ÊÇÒ»¸öÖ¸ÏòÊý×éÊ×µØÖ·µÄ³£Á¿Ö¸Õë
strcpy(a,"abc");//Êý×éÃû×öÓÒÖµ£¬ÍË»¯ÎªÆÕͨµÄÖ¸Õë
Ô­ÎÄÁ´½Ó£º
 http://hi.baidu.com/%D2%C0%BD%A3%D0%F9/blog/item/7bbf36966c92f36a54fb9663.html
×÷ÕߣºËᦻª e ......

C/C++Êý×éÃûÓëÖ¸ÕëÇø±ð

 ÒÔÏÂÎÄÕÂתÔØÓÚ:ΪÁËѧϰºÍÊÕ²Ø
http://tech.163.com/school · 2005-08-23 11:05:18 · À´Ô´: Ì켫Íø
C/C++Êý×éÃûÓëÖ¸ÕëÇø±ð
¡¡¡¡ÒýÑÔ
¡¡¡¡Ö¸ÕëÊÇC/C++ÓïÑÔµÄÌØÉ«£¬¶øÊý×éÃûÓëÖ¸ÕëÓÐÌ«¶àµÄÏàËÆ£¬ÉõÖÁºÜ¶àʱºò£¬Êý×éÃû¿ÉÒÔ×÷ΪָÕëʹÓá£ÓÚÊǺõ£¬ºÜ¶à³ÌÐòÉè¼ÆÕ߾ͱ»¸ãºýÍ¿ÁË¡£¶øÐí¶àµÄ´óѧÀÏʦ£¬ËûÃÇ ......

²âÊÔ¶ÔCµÄÕÆÎճ̶È

 
ÏÂÃæÕâ¸ö³ÌÐòÊä³öʲô£¿
enum {false,true};
int main()
{
int i=1;
do
{
printf("%d\n",i);
i++;
if(i < 15)
continue;
}while(false);
return 0;
}
ÄãÏàÐÅô£¿ÏÂà ......

CÖкê#ºÍ##µÄÔËÓÃ

 #include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#define f(a,b) a##b
#define g(a)  #a
#define h(a) g(a)
int main()   
{   
    char a = 'a';      
    ......

CÌâÄ¿3

1. ÓÃÔ¤´¦ÀíÖ¸Áî#define ÉùÃ÷Ò»¸ö³£Êý£¬ÓÃÒÔ±íÃ÷1ÄêÖÐÓжàÉÙÃ루ºöÂÔÈòÄêÎÊÌ⣩
#define SECONDS_PER_YEAR   (60 * 60 * 24 * 365)UL
ÎÒÔÚÕâÏë¿´µ½¼¸¼þÊÂÇ飺
     1). #define Óï·¨µÄ»ù±¾ÖªÊ¶£¨ÀýÈ磺²»ÄÜÒԷֺŽáÊø£¬À¨ºÅµÄʹÓ㬵ȵȣ©
     2). ¶®µÃÔ¤´¦ÀíÆ÷½«Î ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ