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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<setjmp.h>
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) 6
(d) 7
µÚ3Ìâ:¿¼²éµÝ¹éµ÷ÓÃ
int  foo ( int x , int  n)
{
  int val;
  val =1;
  if (n>0)
  {
    if (n%2 == 1) val = val *x;
   


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