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C³ÌÐò£º´òÓ¡1,2,3,..,nµÄÈ«ÅÅÁÐ

/*
˼·£ºµÝ¹éËã·¨
ǰ0..cur-1λÖÃÉÏÒѾ­Åźã¬µ±Ç°curλÖÃȡһ¸öºÍÇ°Ãæ¶¼²»Ò»ÑùµÄ£¬È»ºóµÝ¹é´¦ÀíºóÃæµÄ¡£
*/
/* Êä³ö1,2,3,..,nµÄÅÅÁÐÊý */
#include <stdio.h>
#include <assert.h>
#include <malloc.h>
void p(int n)
{
extern void _p(int n, int cur, int *a);
int *a;
a = (int *) malloc(n * sizeof(int));
assert(a != NULL);
_p(n, 0, a);
free(a);
}
void _p(int n, int cur, int *a)
{
int i,j;
if (cur == n)
{
for (j=0; j<cur; j++)
{
printf("%d ", a[j]);
}
printf("\n");
return;
}
for (i=1; i<=n; i++)
{
for (j=0; j<cur; j++)
{
if (a[j] == i)
{
break;
}
}
if (j>=cur)
{
a[cur] = i;
_p(n, cur+1, a);
}
}
}
int main()
{
p(3);
}
......

C³ÌÐò£ºÈ·¶¨Ò»¸öÕûÊýµÄ¼ÆËã»úÄÚ²¿±íʾÖÐÓм¸¸ö"1"

/*
×¢Òâ²»¶ÏÓÒÒÆÅжÏ×îµÍλÊÇ1ÓжàÉÙ¸öµÄËã·¨ÊÇ´íÎóµÄ£¬
ÒòΪ¸ù¾ÝGNU C/C++µÄʵÏÖÀ´¿´£¬¸ºÊýÊÇ´ø·ûºÅÌî³ä½øÐÐÓÒÒÆµÄ£¬ËùÒÔÈç¹ûÊǸºÊý£¬¸ÃËã·¨»áËÀÑ­»·¡£
±äͨ°ì·¨£ºJava¿ÉÒÔÓÃ>>>Âß¼­ÓÒÒÆÎ»²Ù×÷·û£¬C/C++¿ÉÒÔÇ¿ÖÆ×ª»»³ÉÎÞ·ûºÅÕûÊýÔÙ´¦Àí
ÏÂÃæµÄ³ÌÐòÊÇÕý½â¡£ÆäÖÐnum &= (num - 1) »áÏû³ýnumµÄ×îСλÖõÄ"1"
*/
#include <stdio.h>
int numOnesInBinary(int num)
{
int numOnes = 0;
while (num != 0) {
num &= (num - 1);
numOnes++;
}
return numOnes;
}
int main()
{
printf("%d", numOnesInBinary(-1));
return 0;
}
......

C³ÌÐò£ºÅжÏÁ´±íÊÇ·ñÓл·

/*
ÕâÊǸö³£¼ûµÄÃæÊÔÌâŶ£¬×ÜÖ®ÎÒÃæÊÔµÄʱºòÓöµ½¹ý£¬ µ±Ê±Ã»ÓдðÉÏÀ´
»ØÈ¥ºóÏë³öÀ´ÏÂÃæµÄ·½·¨Ò»£¬¸Ã·¨»¹Óиö¸½¼ÓÓŵ㣬¿ÉÒÔÅжϳöÁ´±íÔÚÄĸöµØ·½Ðγɻ·µÄ£¨¼´Èç¹ûÏë²ð¿ªÕâ¸ö»·£¬´ÓÄĸöµØ·½¶Ï¿ª£©¡£
ºóÀ´ÖªµÀ»¹Óиö¾­µäËã·¨£¬¼´Ê¹ÓÃÁ½¸öÖ¸Õ룬һ¿ìÒ»ÂýÏòǰÊÔ̽£¬Èç¹û×îÖÕÖØºÏÔòÁ´±íÓл·£¬¹ûÈ»ÓÅÃÀµÄËã·¨¡£
*/
#include <stdio.h>
typedef struct list {
    int data;
    struct list *next;
} LIST;
/* Method 1: check the occurrence of p->next from head to p */
int check_circle_1(LIST *head) {
    LIST *p = head, *q= NULL;
    if (p == NULL)
        return 0;
    while (p->next) {
        /* check whether p points t ......

C³ÌÐò£º¶¨Òåºê´òӡijλÓò¹²ÓжàÉÙλ

#include <stdio.h>
#define bits(p, d) { \
int _tmp=p->d, _bits=0; \
for (p->d=1; p->d; p->d<<=1) \
_bits++; \
p->d=_tmp; \
printf("%s->%s has %d bits", #p, #d, _bits); \
}
typedef struct _s{
int a:4;
} S;
int main()
{
S tmp, *s = &tmp;
bits(s,a);
}
/* Êä³ö£º s->a has 4 bits */ ......

c new

C++ newÓ÷¨Ïà¹Ø¾­Ñé×ܽá
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¡¡¡¡string *str = new string(¡°test new¡±);
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¡¡void *operator new(size_t size);
¡¡¡¡newº¯Êý·µ»ØµÄÊÇÒ»¸övoidÖ¸Õ룬һ¿éδ¾­³õʼ»¯µÄÄÚ´æ¡£ÈçÄãËù¼û£¬ÕâºÍCÓïÑÔµ ......

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