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  1) ÏÂÃæµÄ²âÊÔÌâÖУ¬ÈÏΪËùÓбØÐëµÄÍ·Îļþ¶¼ÒѾ­ÕýÈ·µÄ°üº¬ÁË
    2)Êý¾ÝÀàÐÍ   
        char Ò»¸ö×Ö½Ú 1 byte
        int Á½¸ö×Ö½Ú 2 byte (16λϵͳ £¬ÈÏΪÕûÐÍÊÇ2¸ö×Ö½Ú)
        long int Ëĸö×Ö½Ú 4 byte
        float  Ëĸö×Ö½Ú4 byet
        double °Ë¸ö×Ö½Ú 8 byte
        long double Ê®¸ö×Ö½Ú 10 byte
        pointer Á½¸ö×Ö½Ú 2 byte(×¢Ò⣬16λϵͳ,µØÖ·×ÜÏßÖ»ÓÐ16λ)
µÚ1Ìâ: ¿¼²é¶Ôvolatile¹Ø¼ü×ÖµÄÈÏʶ
#include
static jmp_buf  buf;
main()   
{
  volatile  int b;
  b =3;
  if(setjmp(buf)!=0)  
  {
    printf("%d ", b);  
    exit(0);
  }
  b=5;
  longjmp(buf , 1);
}  
ÇëÎÊ£¬Õâ¶Î³ÌÐòµÄÊä³öÊÇ
(a) 3
(b) 5
(c) 0
(d) ÒÔÉϾù²»ÊÇ
µÚ2Ìâ:¿¼²éÀàÐÍת»»
main()
{
  struct node
  {
    int a;
    int b;
    int c;   
  };
  struct node  s= { 3, 5,6 };
  struct node *pt = &s;
  printf("%d" ,  *(int*)pt);
}
Õâ¶Î³ÌÐòµÄÊä³öÊÇ:
(a) 3
(b) 5
(c)


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