int x=100;
int y=200;
const int *p=&x;
*p=1; //报错
p=&y; //可以
int * const p2=&x;
*p2=1; //可以
p2=&y; //报错
const int * const p3 =&x;
*p3=1; //报错
p3=&y; //报错
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int x=100;
int y=200;
const int *p=&x;
*p=1; //报错
p=&y; //可以
int * const p2=&x;
*p2=1; //可以
p2=&y; //报错
const int * const p3 =&x;
*p3=1; //报错
p3=&y; //报错
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