我写的程序哪里出了问题，编译不通过

Question

编写一个类Class15_1，声明一个数据成员int value和一个静态数据成员int staticV（初始化为0），让构造函数初始化数据成员value，并让静态数据成员staticV加1，让析构函数把静态数据成员staticV减1。主程序中使用new操作符创建三个堆对象，value值分别为5，80，20。然后显示它们的数据成员和静态数据成员，再依次使用delete操作符析构每个对象，并显示对静态数据成员的影响。
输入无输出5
80
20
3
2
1
0

#include<bits/stdc++.h>
using namespace std;
class Class15_1{
    int value;
    int static staticV;
    public:
        
        Class15_1(int a){
            value=a;
            staticV+=1;
            
        }
        void show(){
            cout<<value<<endl;
            cout<<staticV<<endl;
        }
        ~Class15_1(){
            staticV-=1;
            
        }
}; 

int main(){
    Class15_1* p=new Class15_1[3];
    
    p[0]->Class15_1(5);
    p[1]->Class15_1(80);
    p[2]->Class15_1(20);
    p[0]->show();
    p[1]->show();
    p[2]->show();
    delete p;
    
}

Answer 1

修改如下，供参考：

#include <iostream>
//#include<bits/stdc++.h>
using namespace std;
class Class15_1{
    int value;
    int static staticV; //声明但未定义，还未分配内存
    public:

        Class15_1(int a){
            value=a;
            staticV+=1;
        }
        void show(){
            cout<<value<<endl;
            cout<<staticV<<endl;
        }
        ~Class15_1(){
            staticV-=1;
            show();
        }
};
int Class15_1::staticV = 0;//静态成员变量，初始化。

int main(){
    //Class15_1* p = new Class15_1[3];
    Class15_1* p1 = new Class15_1(5);
    Class15_1* p2 = new Class15_1(80);
    Class15_1* p3 = new Class15_1(20);
               //p[0]->Class15_1(5);
               //p[1]->Class15_1(80);
               //p[2]->Class15_1(20);
    p1->show();//p[0]->show();
    p2->show();//p[1]->show();
    p3->show();//p[2]->show();

    cout<<endl<<"delete"<<endl;
    delete p1;
    p1=NULL;
    delete p2;
    p2=NULL;
    delete p3;
    p3=NULL;
   
    return 0;
}

或是这样写，更符合题意：

#include <iostream>
//#include<bits/stdc++.h>
using namespace std;
class Class15_1{
    int value;
    int static staticV; //声明但未定义，还未分配内存
    public:

        Class15_1(int a){
            value=a;
            staticV+=1;
        }
        void show(){
            cout<<value<<endl;
            cout<<staticV<<endl;
        }
        ~Class15_1(){
            staticV-=1;
            show();
        }
};
int Class15_1::staticV = 0;//静态成员变量，初始化。

int main(){
    //Class15_1* p = new Class15_1[3];
    Class15_1* p1 = new Class15_1(5);
    p1->show();
    Class15_1* p2 = new Class15_1(80);
    p2->show();
    Class15_1* p3 = new Class15_1(20);
    p3->show();
    //p[0]->Class15_1(5);
    //p[1]->Class15_1(80);
    //p[2]->Class15_1(20);
    //p[0]->show();
    //p[1]->show();
    //p[2]->show();

    cout<<endl<<"delete"<<endl;
    delete p1;
    p1=NULL;
    delete p2;
    p2=NULL;
    delete p3;
    p3=NULL;

    return 0;
}