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const int a=0;
int *p=&a;
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           const int a=0£»
           int *p=£¨int *£©&a£»
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    1)ÔÚgccÖУ¬±àÒëÖ´ÐÐÒÔÏ´úÂ룺
const    int c=2;
      int *p=&c;
      *p=1;
printf("c is :%d\n",c);
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c is 1
 
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     2.½ÓÏÂÀ´¿´ÏÂÃæÒ»¶Î´úÂ룺
#include <stdio.h>
#include <unistd.h>
int main(void)
{
      const   int c=2;
      int a=0;
     
      const int *p;
      p=&a;
     
      int *p2=&a;
      p2[1]=-1;
 
      printf("p2[1] is :%d\n",p2[1]);
      printf("a is :%d\n",a);
      printf("c is :%d\n",c);
      printf("c address is:%d\n",&c);
      printf("p2[1] address is:%d\n",p2+1);
      printf("*(&c) is :%d\n",*(&c));
}
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p2[1] is :-1
a is :0
c is :-1
c address is:-1076230280
p2[1] address is:-1076230280
*(&c) is :-1
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