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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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