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/*
˼·£ºµÝ¹éËã·¨
´Ó¿ªÊ¼ÍùºóµÝÔöµØÐ´Êý×Ö£¬µ±Ç°´ÓnowÖµ¿ªÊ¼£¬´æ´¢µÄλÖôÓcur¿ªÊ¼£¬
ÔòÏÔÈ»¼ÓÉÏ£¬now..n£¬¶¼ÊÇеÄ×éºÏÊý£¬¶ÔÓÚÿһ¸ö£¬{ Êä³öÖ®£¬È»ºóµÝ¹é£¬´¦Àí _c(n, cur+1, a, i+1) }
*/
/* Êä³ö1,2,3,..,nµÄ×éºÏÊý */
#include <stdio.h>
#include <assert.h>
#include <malloc.h>
void c(int n)
{
extern void _c(int n, int cur, int *a, int now);
int *a;
a = (int *) malloc(n * sizeof(int));
assert(a != NULL);
_c(n, 0, a, 1);
free(a);
}
void _c(int n, int cur, int *a, int now)
{
int i,j;
for (i=now; i<=n; i++)
{
a[cur] = i;
for (j=0; j<=cur; j++)
{
printf("%d ", a[j]);
}
printf("\n");
_c(n, cur+1, a, i+1);
}
}
int main()
{
c(3);
}


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int a[10], *p, i=2;
¿ÉÒÔͨ¹ýÒÔÏÂÈκÎÒ»ÖÖ·½·¨·ÃÎÊa[i];
p = a; p[i];
p = a; *(p+a);
p = a + i; *p
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GNU C __attribute__ »úÖÆ¼ò½é

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