这一章更多的是在讲C说话的器材。

Pointers to const Objects

const double ptr

const Pointers

double const ptr = &value //必须初始化

const Pointer to a const Object

cosnt double const ptr = &value

Pointers and Typedefs

Typedef string pstring

const pstring cstr;

其实const pstring cstr 等价于 string const cstr

const int pci_ok = new const int[100]（）  //初始化为0

[] pia //数组删除动态内存

char arr[0]                    //error: cannot define zero-length array

char cp = new char[0]  //ok: but cp cannot be dereferenced

int ip[4]                     //array of pointers to int

int （ip）[4]                  //pointer to an array of 4 ints

Library strings and C-style Strings

＃include <iostream>

＃include <string>

＃include <cstring>

using namespace std;



int main（）

{

    string s（abcdefghi）;

    const char str = s.c_str（）; //The array return by c_str is not guaranteed to be valid indefinitely

    s[0] = w;

    cout << s << endl;

    cout << str << endl;

    return 0;

}