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#if ULONG_MAX == 0xFFFFFFFF
inline unsigned long byte_swap(unsigned long x) { return __builtin_bswap32(x); }
inline long byte_swap(long x) { return __builtin_bswap32(x); }
#else
inline unsigned long byte_swap(unsigned long x) { return __builtin_bswap64(x); }
inline long byte_swap(long x) { return __builtin_bswap64(x); }
#endif // ULONG_MAX
µ± ULONG_MAX 䶨Òåʱ£¬±»ÅжÏΪ¼Ù£¡¶àôΣÏÕµÄÒ»¸öÏÝÚ壡
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#ifdef ULONG_MAX
# if ULONG_MAX != 0xFFFFFFFFul
# if ULONG_MAX != 0xFFFFFFFFFFFFFFFFul
# error "ULONG_MAX error" is ULONG_MAX
# endif
# endif
#else
# error "ULONG_MAX is not defined"
#endif
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int arr[]={6,7,8,9,10};
int *ptr=arr;
*(ptr++)+=123;
printf("%d,%d",*ptr,*(++ptr));
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