【C++总结】C++的new和delete

使用new的情况

new的运行步骤

使用new开辟内存空间

int *p = new int;
*p = 2;
cout << *p <<endl;//2

int *p = new int(2);
cout << *p <<endl;

string *str = new string();//初始化为空的字符串
string *str = new sting;//默认初始化为空
int *pi = new int();//初始化为0
int *pi = new int;//不初始化

int *p = new int[10];//等于p[10]
p[0] = 5;//p就是数组的首地址
cout << p[0] <<endl;

Person *person = new Person();

使用delete

delete p//释放变量
delete  []p//释放数组
delete person//释放对象

delete运行步骤

delete之后让指针为空

delete p;
p = 0;

const对象的分配与释放

//const对象只能赋给const指针
const int *p = new int(1024);

//删除const指针
delet p;