Who can teach me?

Comments

• AsmGuru62

  July 2010

  [code]
  : int x = 6, *p;
  
  [color=Green]/**
  Address p is pointed to x
  **/[/color]
  : p = &x;
  
  [color=Green]/**
  First, find out what value is on the right side of
  the expression:
  
  ++x - first, increment x and THEN USE it in expression
  x++ - first, USE x in expression and THEN increment it
  
  1. Incremented x will mean 7
  2. 7 must be added to a location pointed by p
  3. But, location p points to x, which is now 7
  4. 7+7 = 14 (x will be now 14)
  **/[/color]
  : *p += ++x;
  [/code]
  
• kinkilee

  July 2010

  so, the answer is 14?
  
  what is the meaning of *p?
  (int *p) = p is a pointer to an integer. Rite?
  
  Then, now the answer is 7, your explained is well, i can understand.
  
  But, how become 7+7=14?
  
  : *p += ++x; means what?
  
  Sorry! I'm a stupid...
  
• keysrecover

  August 2010

  this is simple:
  *p is the value of pointer p
  ++x means x=x+1
  *p+=++x equivalent to *p=*p+++x or *p=*p+x+1
  
  
  
  
  
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• HK_MP5KPDW

  August 2010

  Undefined behavior.