[×ªÔØ]C/C++ÓïÑÔÎóÇøÒ» —— void main( )
ÔÚÍøÉÏ¿´µ½ÁËÕâÆªÎÄÕ£¬·Ç³£²»´í£¬»ñÒæ·Ëdz£¬ÓÚÊÇת¹ýÀ´£¬Ï£ÍûÄܶԴó¼ÒÓÐËùñÔÒæ¡£ÎÄÕÂÔ×÷Õߣºantigloss http://free3.e-168.cn/antigloss/
ºÜ¶àÈËÉõÖÁÊÐÃæÉϵÄһЩÊé¼®£¬¶¼Ê¹ÓÃÁËvoid main( ) £¬ÆäʵÕâÊÇ´íÎóµÄ¡£C/C++ ÖдÓÀ´Ã»Óж¨Òå¹ývoid main( ) ¡£C++ Ö®¸¸ Bjarne Stroustrup ÔÚËûµÄÖ÷Ò³É쵀 FAQ ÖÐÃ÷È·µØÐ´×Å The definition void main( ) { /* ... */ } is not and never has been C++, nor has it even been C.£¨ void main( ) ´ÓÀ´¾Í²»´æÔÚÓÚ C++ »òÕß C £©¡£ÏÂÃæÎÒ·Ö±ð˵һÏ C ºÍ C++ ±ê×¼ÖÐ¶Ô main º¯ÊýµÄ¶¨Òå¡£
1. C
ÔÚ C89 ÖУ¬main( ) ÊÇÕýÈ·µÄ¡£Brian W. Kernighan ºÍ Dennis M. Ritchie µÄ¾µä¾ÞÖø The C programming Language£¨¡¶C ³ÌÐòÉè¼ÆÓïÑÔ¡·£©ÓõľÍÊÇ main( )¡£²»¹ýÔÚ×îÐ嵀 C99 ±ê×¼ÖУ¬Ö»ÓÐÒÔÏÂÁ½ÖÖ¶¨Ò巽ʽÊÇÕýÈ·µÄ£º
int main( void )
int main( int argc, char *argv[] )
£¨²Î¿¼×ÊÁÏ£ºISO/IEC 9899:1999 (E) Programming languages — C 5.1.2.2.1 Program startup£©
µ±È»£¬ÎÒÃÇÒ²¿ÉÒÔ×öÒ»µãССµÄ¸Ä¶¯¡£ÀýÈ磺char *argv[] ¿ÉÒÔд³É char **argv£»argv ºÍ argc ¿ÉÒԸijɱðµÄ±äÁ¿Ãû£¨Èç intval ºÍ charval£©£¬²»¹ýÒ»¶¨Òª·ûºÏ±äÁ¿µÄÃüÃû¹æÔò¡£
Èç¹ûÄã²»ÐèÒª´ÓÃüÁîÐÐÖлñÈ¡²ÎÊý£¬ÇëÓà int main( void ) £»·ñÔòÇëÓà int main( int argc, char *argv[] ) ¡£
main º¯ÊýµÄ·µ»ØÖµÀàÐͱØÐëÊÇ int £¬ÕâÑù·µ»ØÖµ²ÅÄÜ´«µÝ¸ø³ÌÐòµÄ¼¤»îÕߣ¨Èç²Ù×÷ϵͳ£©¡£
Èç¹û main º¯ÊýµÄ×îºóûÓÐд return Óï¾äµÄ»°£¬C99 ¹æ¶¨±àÒëÆ÷Òª×Ô¶¯ÔÚÉú³ÉµÄÄ¿±êÎļþÖУ¨Èç exe Îļþ£©¼ÓÈë return 0 £¬±íʾ³ÌÐòÕý³£Í˳ö¡£²»¹ý£¬ÎÒ»¹Êǽ¨ÒéÄã×îºÃÔÚ main º¯ÊýµÄ×îºó¼ÓÉÏ return Óï¾ä£¬ËäȻûÓÐÕâ¸ö±ØÒª£¬µ«ÕâÊÇÒ»¸öºÃµÄϰ¹ß¡£×¢Ò⣬vc6 ²»»áÔÚÉú³ÉµÄÄ¿±êÎļþÖмÓÈë return 0 £¬´ó¸ÅÊÇÒòΪ vc6 ÊÇ 98 ÄêµÄ²úÆ·£¬ËùÒԲŲ»Ö§³ÖÕâ¸öÌØÐÔ¡£ÏÖÔÚÃ÷°×ÎÒΪʲô½¨ÒéÄã×îºÃ¼ÓÉÏ return Óï¾äÁ˰ɣ¡²»¹ý£¬gcc3.2£¨Linux ϵ
Ïà¹ØÎĵµ£º
1.MFCÖеķ½·¨£º(C++) CFileStatus status;
CFile::GetStatus("D:\\test.txt",status);
long lSizeOfFile;
lSizeOfFile = status.m_size; lSizeOfFileµÄÖµ¾ÍÊÇD:\\test.txtÎļþµÄ´óС 2.±ê×¼C»ñµÃÎļþ´óСµÄ5ÖÖ·½·¨
(×¢Ò⣺"__FILE__"Ö¸µÄÊǵ±Ç°Îļþ£¬Äã¿ÉÒÔ¸ÄΪÓÐЧ·¾¶µÄÄ¿±êÎļþ£¬±ÈÈç"D:\\test.tx ......
C/C++ÊDz»¼ì²éÊý×éϱêÊÇ·ñÔ½½çµÄ¡£
²»¼ì²éϱêÊÇ·ñÔ½½ç¿ÉÒÔÓÐЧÌá¸ß³ÌÐòÔËÐеÄЧÂÊ£¬ÒòΪÈç¹ûÄã¼ì²é£¬ÄÇô±àÒëÆ÷±ØÐëÔÚÉú³ÉµÄÄ¿±ê´úÂëÖмÓÈë¶îÍâµÄ´úÂëÓÃÓÚ³ÌÐòÔËÐÐʱ¼ì²âϱêÊÇ·ñÔ½½ç£¬Õâ¾Í»áµ¼Ö³ÌÐòµÄÔËÐÐËÙ¶ÈϽµ£¬ËùÒÔΪÁ˳ÌÐòµÄÔËÐÐЧÂÊ£¬C/C++²Å²»¼ì²éϱêÊÇ·ñÔ½½ç¡£
  ......
[CÓïÑÔ]fopen()º¯ÊýµÄ²ÎÊý˵Ã÷
2007Äê06ÔÂ05ÈÕ ÐÇÆÚ¶þ 23:55
¸ñʽ£ºÎļþÖ¸ÕëÃû=fopen(ÎļþÃû£¬Ê¹ÓÃÎļþ·½Ê½)
²ÎÊý£º
ÎļþÃû ÒâÒå
"C:/temp/temp.txt" Îļþ C:\temp\temp.txt
ÎļþʹÓ÷½Ê½ ¡¡ Òâ Òå
“rt”¡¡¡¡¡¡¡¡¡¡Ö»¶Á´ò¿ªÒ»¸öÎı¾Îļþ£¬Ö»ÔÊÐí¶ÁÊý¾Ý
“wt”¡¡¡¡¡¡¡¡ ֻд ......
C/C++±ÊÊÔÌâϵÁÐ
Ô¤´¦ÀíÆ÷£¨Preprocessor£©
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«ÎªÄã¼ÆËã³ ......
CÖеĿɱä²ÎÊýÑо¿
Ò»£® ºÎν¿É±ä²ÎÊý
int printf(const char* format, ...);
ÕâÊÇʹÓùýCÓïÑÔµÄÈËËùÔÙÊìϤ²»¹ýµÄprintfº¯ÊýÔÐÍ£¬ËüµÄ²ÎÊýÖоÍÓй̶¨²ÎÊýformat ......