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apple=sizeof(int)*p  ;   apple=sizeof * p;
j= (char (*)[20])malloc(20);
int   const * grape; Óë   int * const grape; µÄÇø±ð 
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void (*signal(int sig,void (*func)(int )))(int );  
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       ËÄ: apple=sizeof(int)*p  ;   apple=sizeof * p;    //ÊÇʲôÒâ˼?   ÁíÍâ, y=sizeof x; ÄܱàÒëͨ¹ýÂð?
       Îå:  j= (char (*)[20])malloc(20);                     //ÔõôÑù?
       Áù:  result=*x/*y ;     //³ö´í?why   ?   
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