CÉî¶È½âÆÊÎÊÌâ´úÂë·ÖÎö±Ê¼Ç1
#include <stdio.h>
int main()
{
int a[5]={1,2,3,4,5};
int *ptr1=(int*)(&a+1);
int *ptr2=(int*)((int)a+1);
printf("%p,%x,%p\n",(int)a,*(ptr2+1),ptr1);//(int*)(&a));
printf("%d\n",(int*)(&a-16));
printf("%d,%x\n",ptr1[-1],*ptr2);
return 0;
}
ÔÚÁ½¶ÎºÜ¶ÌµÄ³ÌÐòÉϺÄÁËÕû¸öÍíÉÏ£¬²»¹ý¸Ð¾õ»¹²»´í£¬ÍêÈ«¿¿×Ô¼ºµ÷ÊÔ·ÖÎöµÄ¹ý³ÌºÜÓгɾ͸С£
²»¹ýgdb»¹Ò»µã¶¼²»»áÓã¬ÊÔ¹ýÊÖ²áÀïµÄgdb program£¬µ«ÊÇÖ®ºó list ³öÀ´µÄÎļþÃûÈ´ÊÇij"Start.S"£¬²ÎÊýµÄÓ÷¨»¹Ã»Àí½â£¬µ±Ê±Ò²Ã»¹ÜÕâô¶à£¬¼±×ÅÏëÒª¸ãÇå³þÕâÁ½¶Î³ÌÐòµÄÔÀí£¬ËùÒÔ¾ÍÖ±½ÓÓÃprintfÀ´µ÷ÊÔÁË¡££¨Ï£ÍûÓз¹ýµÄ
¸ßÊÖÄÜÖ¸µãһϣ¬¼òµ¥ËµÒ»Ï³£ÓòÎÊýµÄÉèÖþÍÐУ¬¸Ð¼¤Íò·Ö£¡
£©
ÓÚÊÇ£¬Í¨¹ýÐÞ¸ÄÁËN´ÎµÚÒ»¸öprintfµÄ²ÎÊý£¬ÊÕ¼¯µ½ÒÔÏÂÊý¾Ý£º
1.(int)a == (int*)(&a) == &a
2.(int*)(&a+1) - 14h == (int)a£¬
(int*)(&a+2) - 28h == (int)a
3.int a[6]={1,2,9,4,5,6}ʱ£¬
(int*)(&a+1) - 15h == (int)a£¬
(int*)(&a+2) - 30h == (int)a
4.
ptr1[-1]==5,
ptr1[-2]==4,
ptr1[-3]==3,
ptr1[-4]==2,
ptr1[-5]==1
5.Ìí¼Ó£º
int i;
for(i=0;i<20;i++)
{
unsigned *p=(unsigned*)((int)a+i);
printf("%lx\n",*p);
}
µÃ³ö£º
1
2000000
20000
200
2
3000000
30000
300
3
4000000
40000
400
4
5000000
50000
500
5
8d000000
cd8e0000
a0cd8f00
int i;
for(i=0;i<20;i++)
{
char *p=(char*)((int)a+i);
printf("%x",*p);
}
µÃ³ö£º10002000300040005000
ÍÆÀí½á¹û£º
Ò»¡¢¿ÉÒÔµÃÖª(&a+1)±ÈaµÄµØÖ·¸ß³ö0x14h,Ò²¾ÍÊÇ20£¬¶ø¸ÕºÃ5¸öintÐÍËùÕ¼µÄÄÚ´æÒ²ÊÇ20£¬ÔÙ½áºÏÌõ¼þ3¿ÉÒÔÍƶϳö
int *ptr1=(int*)(&a+1);´Ë¾äÊÇÒª°Ñptr1Ö¸ÏòÊý×éaºó1×Ö½Ú£¬¶øptr1[-x]ÔòÊÇ´Ó(£¦a£«1)ºóÍË£¬ÒòΪptr1ÊÇint *£¬ËùÒÔÿ¼õ1¾ÍÏòÇ°ÒÆ4×Ö½Ú¡£
¶þ¡¢(&a+x)»áÒÔ x*sizeof(a) ÏßÐÔµÝÔö¡£
Èý¡¢ÒòΪÎÒµÄÊÇ32λ»ú£¬unsignedºÍint´óС¶¼ÊÇ4×Ö½Ú£¬ËùÒÔ²âÊÔ´úÂëºÍÔ³ÌÐòµÄunsigned *ºÍint *¶¼ÊÇÿ´Î´ÓÄÚ´æ¶ÁÈ¡4×Ö½Ú£¬¶øÇÒ¿ÉÒÔÍÆÀí³öÎ
Ïà¹ØÎĵµ£º
1)ÔËÐÐʱ¿â¾ÍÊÇ C run-time library£¬ÊÇ C ¶ø·Ç C++ ÓïÑÔÊÀ½çµÄ¸ÅÄî:È¡Õâ¸öÃû×Ö¾ÍÊÇÒòΪÄãµÄ C ³ÌÐòÔËÐÐʱÐèÒªÕâЩ¿âÖеĺ¯Êý.
2)C ÓïÑÔÊÇËùνµÄ“СÄں˔ÓïÑÔ£¬¾ÍÆäÓïÑÔ±¾ÉíÀ´ËµºÜС£¨²»¶àµÄ¹Ø¼ü×Ö£¬³ÌÐòÁ÷³Ì¿ØÖÆ£¬Êý¾ÝÀàÐ͵ȣ©£»ËùÒÔ£¬C ÓïÑÔÄں˿ª·¢³öÀ´Ö®ºó£¬Dennis Ritchie ºÍ Brian Kernighan ¾ÍÓà C ±¾É ......
C#£¨C sharp£©×Ö·û´®ºÍʱ¼äµÄÏ໥ת»»¡£
Ò»¡¢DateTime –> string
ʱ¼äÀàÐÍת»¯³É×Ö·û´®ÀàÐÍ£¬ÄÇÊÇÏ൱µÄ¼òµ¥£¬Ö±½Óµ÷ÓÃToString()·½·¨¼´¿É¡£È磺
DateTime dt = DateTime.Now;
string dtStr = dt.ToString();
Èç¹ûÏë¶ÔÊä³ö¸ñʽ»¯£¬¿ÉÒÔÕâôд£º
dt.ToString("yyyyÄêMMÔÂddÈÕ"); ......
Netbeans¾³£»á³öÏÖд´úÂëµÄʱºò´úÂëÌáʾ³ö²»À´µÄÇé¿ö£¬ÉõÖÁÊÇ´úÂë¸ù±¾Ã»´í£¬±àÒ붼ÄÜͨ¹ý£¬µ«ÊÇ´úÂë°ïÖú¾ÍÌáʾÎÒ˵ÎÒÓдíÎó£¬ÔÚÏÂÃæ»ÌõºìÏߣ¡¶øÕâЩÎÊÌâEclipseûÓгöÏÖ¹ý£¡¶øÇÒEclipseÓÐרÃŵÄCDT²å¼þ¿ª·¢Ð¡×飬ºÜºÃÇ¿´ó¡£ ......
1.fopen()
¡¡¡¡fopenµÄÔÐÍÊÇ£ºFILE *fopen(const char *filename,const char *mode)£¬fopenʵÏÖÈý¸ö¹¦ÄÜ
ΪʹÓöø´ò¿ªÒ»¸öÁ÷
°ÑÒ»¸öÎļþºÍ´ËÁ÷ÏàÁ¬½Ó
¸ø´ËÁ÷·µ»ØÒ»¸öFILEÖ¸Õë
²ÎÊýfilenameÖ¸ÏòÒª´ò¿ªµÄÎļþÃû£¬mode±íʾ´ò¿ª×´Ì¬µÄ×Ö·û´®£¬ÆäÈ¡ÖµÈçϱí
×Ö·û´® º¬Òå
"r" ÒÔÖ»¶Á·½Ê½´ò¿ªÎļþ ......