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#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 */


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     A.hÄÚÈÝΪ£º
     #ifndef  ......

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#include<stdio.h>
#include<math.h>
float x1,x2,disc,p,q;
int main()
{
void greater_than_zero(float,float);
void equal_to_zero(float,float);
void smaller_than_zero(float,float);
float a,b,c;
printf("\ninput a,b,c:");
scanf("%f,%f,%f",&a,&b,&c) ......

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//ijˮÍõµÄ·¢ÌûÊý³¬¹ý×ÜÌùÊýµÄÒ»°ë£¬ÕÒ³öÖ®
int find(int *ID, int N)
{
int candidate;
int nTimes, i;
for (i = nTimes = 0; i < N; i++)
{
if (nTimes == 0)
{
candidate = ID[i];
nTimes = 1;
}
else if (candidate == ID[i])
{
nTimes++;
}
else
{
nTimes--;
......

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 = ......
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