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C++中的常量指针和指针常量

常量指针

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int a = 1;
int b = 2;

//定义一个常量指针
const int *p = &a;
cout << *p << endl;//输出1

p = &b;
cout << *p << endl;//输出2

//报错，常量指针不可以修改指针指向的值
//*p = 2;

指针常量

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int a = 1;
    int b = 2;

    int * const p = &a;
    cout << *p << endl;//输出1

    *p = 2;
    cout << *p << endl;//输出2
    cout << a << endl;//输出2

    //报错，指针常量不可以修改指针的指向
    //p = &b;