Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

C unsigned int and int

Ê×ÏȽøÐÐÒ»¸öʵÑ飬·Ö±ð¶¨ÒåÒ»¸ösigned intÐÍÊý¾ÝºÍunsigned intÐÍÊý¾Ý£¬È»ºó½øÐдóС±È½Ï£º
unsigned int a=20;
signed int b=-130;
a>b?»¹ÊÇb>a£¿ÊµÑéÖ¤Ã÷b>a£¬Ò²¾ÍÊÇ˵£­130>20,Ϊʲô»á³öÏÖÕâÑùµÄ½á¹ûÄØ£¿
ÕâÊÇÒòΪÔÚCÓïÑÔ²Ù×÷ÖУ¬Èç¹ûÓöµ½ÎÞ·ûºÅÊýÓëÓзûºÅÊýÖ®¼äµÄ²Ù×÷£¬±àÒëÆ÷»á×Ô¶¯×ª»¯ÎªÎÞ·ûºÅÊýÀ´½øÐд¦Àí£¬Òò´Ëa£½20£¬b£½4294967166£¬ÕâÑù±È½ÏÏÂÈ¥µ±È»b>aÁË¡£
ÔÙ¾ÙÒ»¸öÀý×Ó£º
unsigned int a=20;
signed int b=-130;
std::cout<½á¹ûÊä³öΪ4294967186£¬Í¬ÑùµÄµÀÀí£¬ÔÚÔËËã֮ǰ£¬a£½20£¬b±»×ª»¯Îª4294967166£¬ËùÒÔa£«b£½4294967186

¼õ·¨ºÍ³Ë·¨µÄÔËËã½á¹ûÀàËÆ¡£

Èç¹û×÷Ϊsigned intÐÍÊý¾ÝµÄb=-130£¬bÓëÁ¢¼´ÊýÖ®¼ä²Ù×÷ʱ²»Ó°ÏìbµÄÀàÐÍ£¬ÔËËã½á¹ûÈÔȻΪsigned intÐÍ£º
signed int b=-130;
std::cout<Êä³öΪ-100¡£

¶ø¶ÔÓÚ¸¡µãÊýÀ´Ëµ£¬¸¡µãÊý£¨float£¬double£©Êµ¼ÊÉ϶¼ÊÇÓзûºÅÊý£¬unsigned ºÍsignedǰ׺²»ÄܼÓÔÚfloatºÍdoubleÖ®ÉÏ£¬µ±È»¾Í²»´æÔÚÓзûºÅÊý¸ùÎÞ·ûºÅÊýÖ®¼äת»¯µÄÎÊÌâÁË¡£


include
include

define UNSIGNED_SHORT_LT(a , b) (((unsigned short) (((unsigned short) a) - ((unsigned short) b))) > (unsigned short) 0x7fff)
define UNSIGNED_COMP_LT(a , b) ((unsigned int) (((unsigned int) a) - ((unsigned int) b)))

typedef struct test_node {
int num;
struct test_node *next;
} test_node_t;

test_node_t *head;
test_node_t *tail;

void build_link(int num)
{
if (head == NULL) {
test_node_t *tmp = (test_node_t *)malloc(sizeof(test_node_t));
tmp->num = num;
tmp->next = NULL;
head = tail = tmp;
} else {
test_node_t *tmp_add = (test_node_t *)malloc(sizeof(test_node_t));
tmp_add->num = num;
tmp_add->next = NULL;
tail->next = tmp_add;
tail = tmp_add;
}
}

void print_link()
{
test_node_t *p = head;
for (p = head; p; p = p->next)
printf("the %d node address:%x, head:%x, tail:%x\n", p->num, p, head, tail);
}

void clear_link()
{
test_node_t *p = head;

while (p) {
test_node_t *tmp = p;
p = p->next;
printf("free %d node, tmp:%x, p:%x, head:%x, tail:%x\n", tmp->num, tmp, p


Ïà¹ØÎĵµ£º

C# C/S³ÌÐò³ö´í£ºContextSwitchDeadlock is detected

½ñÌìÔÚVS2005µ÷ÊÔÒ»¸öC# C/S³ÌÐò£¬µ±Í¨¹ýRFCÓëSAPÁ¬½Óʱ¼ä¹ý³¤Ê±£¬³öÏÖ´Ë´íÎó£¬ÔÚÍøÉÏÕÒµ½½â¾ö°ì·¨¡£
VS2008ÉϵÄÒ»¸ö³ÌÐò£¬Í¨¹ýOracle.DataAccess.dllÖ´ÐÐdrop user
cascade²Ù×÷£¬ÎÒÔÚsqlplusÖ´Ðд˲Ù×÷´óÔ¼ÐèÒªÒ»·ÖÖÓ×óÓÒʱ¼ä£¬µ±ÎÒÔÚVS2008ÖÐdebugÆô¶¯´Ë³ÌÐòʱ£¬Ò»Ö±½ÓÊÕµ½
“ContextSwitchDeadlock is detected& ......

c³ÌÐòµÄ±äÁ¿¶¨Ò屨ÐëÔÚËùÓк¯Êý֮ǰ£¿£¡

ÓÃvc6н¨ÁËÒ»¸öwin32µÄ¿ØÖÆÌ¨³ÌÐò£¬µ÷ÊÔÒ»¸öÖ±½Ó²åÈëÅÅÐòµÄС³ÌÐò£¬Îļþ¶¨ÒåΪ.cÎļþ£¬¶ø²»ÊÇÒ»°ãʹÓõÄ.cppÎļþ£¬´úÂë¶ÎÈçÏ£º
#include <stdio.h>
void inst(int* x,int n)
{
int i,j,t;
for(i=1; i<n; i++) /* i±íʾ²åÈë´ÎÊý£¬¹²½øÐÐn-1´Î²åÈë*/
{
t = x[i];
for(j=i-1; j> ......

C ÖÐ extern ºÍ static

CÓïÑÔÖУº
extern £ºextern£¨ÍⲿÒýÓã©¿ÉÒÔÖÃÓÚ±äÁ¿»òÕߺ¯Êýǰ£¬ÒÔ±êʾ±äÁ¿»òº¯ÊýµÄ¶¨ÒåÔÚ±ðµÄÎļþÖУ¬ÔÚÒ»¸öÎļþÖÐÓõ½µÄexternÕâЩ±äÁ¿»òº¯ÊýÊÇÍâÀ´µÄ£¬²»ÊDZ¾Îļþ¶¨ÒåµÄ£¬Ìáʾ±àÒëÆ÷Óöµ½´Ë±äÁ¿ºÍº¯ÊýʱÔÚÆäËûÄ£¿éÖÐѰÕÒÆä¶¨Òå¡£×¢Ò⣬ֻÓÐÆäËûÎļþÖеÄÈ«¾Ö±äÁ¿²ÅÄܱ»ÆäËûÎļþËùextern¡£
extern int val;
×¢£º
  ......

CÊäÈëÊä³ö

×ÛÊö
¿´Ò»ÏÂÊäÈë²Ù×÷µÄÔ­Àí£¬
³ÌÐòµÄÊäÈë¶¼½¨ÓÐÒ»¸ö»º³åÇø£¬¼´ÊäÈ뻺³åÇø¡£Ò»´ÎÊäÈë¹ý³ÌÊÇÕâÑùµÄ£¬µ±Ò»´Î¼üÅÌÊäÈë½áÊøÊ±»á½«ÊäÈëµÄÊý¾Ý´æÈëÊäÈ뻺³åÇø£¬¶øcinµÈÊäÈëÊä³öº¯ÊýÖ±½Ó´ÓÊä
È뻺³åÇøÖÐÈ¡Êý¾Ý¡£ÕýÒòΪcinµÈÊäÈëÊä³öº¯ÊýÊÇÖ±½Ó´Ó»º³åÇøÈ¡Êý¾ÝµÄ£¬ËùÒÔÓÐʱºòµ±»º³åÇøÖÐÓвÐÁôÊý¾Ýʱ£¬cinº¯Êý»áÖ±½ÓÈ¡µÃÕâЩ²ÐÁôÊý¾ ......

[ת]ubuntuÏÂc£¯c++¿ª·¢»·¾³ÅäÖÃ

ubuntuϵÄc/c++»·¾³´î½¨ÊDZȽϼòµ¥,ÒòΪÓÐaptºÍÐÂÁ¢µÃµÄ°ïÖú.
1.
Ê×ÏÈÊÇÅäÖÃgcc,ÔÚubuntu°²×°Íê³ÉÒѾ­ÓÐgccÁË(gccÊÇÓÉGNUÖ®¸¸StallmanËù¿ª·¢µÄlinuxϵıàÒëÆ÷£¬È«³ÆÎªGNU
Compiler Collection£¬ Ŀǰ¿ÉÒÔ±àÒëµÄÓïÑÔ°üÀ¨£ºC, C++, Objective-C, Fortran, Java,
and
Ada.).µ«ÊÇgcc»¹²»ÄܱàÒëÎļþ.ÒòΪȱÉÙһЩͷÎļþ.Ä ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ