c ¶ÁÈ¡Îļþ
#include <stdio.h>
int main ()
{
FILE *fp1;
fp1=fopen("test0.txt","rt");
if(fp1==NULL)
{
printf("can not open test0.txt\n");return 0;
} // {} necessary
fclose(fp1);// necessary
return 0;
}
Ïà¹ØÎĵµ£º
Ò»¸öÓÉC/C++±àÒëµÄ³ÌÐòÕ¼ÓõÄÄÚ´æ·ÖΪÒÔϼ¸¸ö²¿·Ö
1¡¢Õ»Çø£¨stack£©— ³ÌÐòÔËÐÐʱÓɱàÒëÆ÷×Ô¶¯·ÖÅ䣬´æ·Åº¯ÊýµÄ²ÎÊýÖµ£¬¾Ö²¿±äÁ¿µÄÖµµÈ¡£Æä²Ù×÷·½Ê½ÀàËÆÓÚÊý¾Ý½á¹¹ÖеÄÕ»¡£³ÌÐò½áÊøʱÓɱàÒëÆ÷×Ô¶¯ÊÍ·Å¡£
2¡¢¶ÑÇø£¨heap£© — ÔÚÄڴ濪±ÙÁíÒ»¿é´æ´¢ÇøÓò¡£Ò»°ãÓɳÌÐòÔ±·ÖÅäÊÍ·Å£¬ Èô³ÌÐòÔ±²»ÊÍ·Å£¬³ÌÐò½áÊøʱ¿É ......
ubuntuϵÄc/c++»·¾³´î½¨ÊDZȽϼòµ¥,ÒòΪÓÐaptºÍÐÂÁ¢µÃµÄ°ïÖú.
1.
Ê×ÏÈÊÇÅäÖÃgcc,ÔÚubuntu°²×°Íê³ÉÒѾÓÐgccÁË(gccÊÇÓÉGNUÖ®¸¸StallmanËù¿ª·¢µÄlinuxϵıàÒëÆ÷£¬È«³ÆΪGNU
Compiler Collection£¬ Ä¿Ç°¿ÉÒÔ±àÒëµÄÓïÑÔ°üÀ¨£ºC, C++, Objective-C, Fortran, Java,
and
Ada.).µ«ÊÇgcc»¹²»ÄܱàÒëÎļþ.ÒòΪȱÉÙһЩͷÎļþ.Ä ......
Ò»¸öCÓïÑÔÔËÐпâ´óÖ°üº¬ÁËÈçϹ¦ÄÜ:
1. Æô¶¯ÓëÍ˳ö: °üÀ¨Èë¿Úº¯Êý¼°Èë¿Úº¯ÊýËùÒÀÀµµÄÆäËüº¯ÊýµÈ
2. ±ê×¼º¯Êý: ÓÉCÓïÑÔ±ê×¼¹æ¶¨µÄCÓïÑÔ±ê×¼¿âËùÓµÓеĺ¯ÊýʵÏÖ.
3. I/O: IO¹¦Äܵķâ×°ºÍʵÏÖ
4. ¶Ñ:¶ÑµÄ·â×°ºÍʵÏÖ
5. ÓïÑÔʵÏÖ: ÓïÑÔÖÐһЩÌØÊ⹦ÄܵÄʵÏÖ.
6. µ÷ÊÔ: ʵÏÖµ÷ÊÔ¹¦ÄܵĴúÂë.
ÔÚÕâЩÔËÐпâµÄ×é³É³É·ÖÖÐ, C ......
Ò»¡¢´ÓCÓëC++±àÒëÁ¬½Ó·½Ê½ÉîÈëÀí½âextern "C"
<1>.CºÍC++¶Ôº¯ÊýµÄ´¦Àí·½Ê½ÊDz»Í¬µÄ.±»extern "C"ÐÞÊεıäÁ¿ºÍº¯ÊýÊÇ°´ÕÕCÓïÑÔ·½Ê½±àÒëºÍÁ¬½ÓµÄ.extern "C"ÓÃÓÚʵÏÖC++ÓëC¼°ÆäËüÓïÑԵĻìºÏ±à³Ì¡£
<2>.δ¼Óextern “C”ÉùÃ÷ʱµÄ±àÒ뷽ʽ
Ê×ÏÈ¿´¿´C++ÖжÔÀàËÆCµÄº¯ÊýÊÇÔõÑù±àÒëµÄ¡£
×÷ΪһÖÖÃæÏò ......
static
DataManager
*
sharedDataManager
=
nil;
+
(DataManager
*
) sharedManager
{
@synchronized(self)
{
if
(sharedDataManager
==
nil)
&nb ......