C++ 中的new 与delete操作符

new 用来在堆中申请一块内存（供应用程序共用），delete用来释放这块内存。new申请的变量生命周期一直持续到程序退出或者用delete操作符删掉这块内存。

for example:

struct NPC{

　　float blood;//血量

　　float magic;//魔法值

　　int lifeValue;//生命值

}

int *p₁ = new int(5);//初始化为5

delete p₁ ;

double *p₂ = new double(2.22);

delete p₂ ;

NPC *p₃ = new NPC{98.4,76.0,100};

delete p₃ ;

int *P₄ = new int[10];

P₄[0] = 10;

P₄[1] = 11;

delete P4;

 1 #include <iostream>
 2 using namespace std;
 3 
 4 struct NPC {
 5 char Name[20];
 6 int age;
 7 bool sex;//男=0，女=1
 8 };
 9 int main() {
10 
11 int *p1 = new int(5);
12 int *p2 = new int[3]{100,200,300};
13 NPC *p3 = new NPC{"mk",17,0};
14 cout << p3->Name <<","<< p3->age << "," << p3->sex << endl;
15 cout << *p1 << endl;
16 cout << *p2 << "," << *(p2+1) << "," << *(p2+2) << endl;
17 //system("pause");
18 delete p1;
19 delete p2;
20 delete p3;
21 return 0;
22 
23 }

posted on 2019-12-26 22:00 mktest123 阅读(189) 评论(0) 收藏举报