C |指针基础|问题13-yiteyi-C++库

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                     int                               f(                               int                               x,                               int                               *py,                               int                               **ppz)                   
                     {                   
                                         int                               y, z;                   
                                         **ppz += 1;                   
                                         z  = **ppz;                   
                                         *py += 2;                   
                                         y = *py;                   
                                         x += 3;                   
                                         return                               x + y + z;                   
                     }                   
                             
                     void                               main()                   
                     {                   
                                         int                               c, *b, **a;                   
                                         c = 4;                   
                                         b = &c;                   
                                         a = &b;                   
                                         printf                               (                               "%d "                               , f(c, b, a));                   
                                         return                               0;                   
                     }                   

（A） 18 （B） 19 （C） 21 （D） 22 答复: （B） 说明： 让我们逐行理解这一点

  /* below line changes value of c to 5. Note that x remains unaffected by 
    this change as x is a copy of c and address of x is different from c*/
  **ppz += 1  
  
  /* z is changed to 5*/
  z  = **ppz; 
  
  /* changes c to 7, x is not changed */
  *py += 2; 
  
   /* y is changed to 7*/
  y = *py;    
  
  /* x is incremented by 3 */
   x += 3;    
  
  /* return 7 + 7 + 5*/
  return x + y + z;

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