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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 
typedef void (*ptr_to_func)(int);
void (*signal(int sig,void (*func)(int )))(int );  
¼¸¸öÑùÀý:
        Ò»:char *a; const char *b;   a=b;//³öÏÖ¾¯¸æ.         why?
        ¶þ: const int two =2;
            switch(i)
             {
              case 1:printf("case 1 !  \n");
              case two :printf("case 2\n");
              }
            ±àÒë³ö´í,˵Ã÷ÁË.....?
       Èý:switch(){..}ÖÐ°Ñ default¸Ä³É defau1t (ÎÞÐÄÖ®¹ý,»òÆäËü±êÇ©Èçdefavlt,dafault..)¶¼±àÒëͨ¹ý .  why?
       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   ?   
             z=y+++x;   ¼´Îª: z=y++ +x;    µ«z=y+ + +x; &n


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