声明一个Cat类，拥有静态数据成员HowManyCats，用以记录Cat的个体数目；拥有静态成员函数GetHowMany（），用以存取HowManyCats。 - 编程论坛

#2

yangfrancis2016-04-26 23:22

class Cat
{
public:
    Cat(){HowManyCats=0;}
    Cat(int s){HowManyCats=s;}
    int GetHowMany(){return HowManyCats;}
private:
    int GowManyCat;
}

#3

qq69023032016-04-28 06:48

回复 2楼 yangfrancis

就这样吗？主函数main那些呢？

#4

rjsp2016-04-29 08:41

安装题目的意思，应当如下

程序代码：

class Cat
{
public:
    Cat()
    {
        ++HowManyCats;
    }
    Cat( const Cat& )
    {
        ++HowManyCats;
    }
    ~Cat()
    {
        --HowManyCats;
    }

public:
    static size_t GetHowMany()
    {
        return HowManyCats;
    }
private:
    static size_t HowManyCats;
};

size_t Cat::HowManyCats = 0;

#include <iostream>
using namespace std;

int main( void )
{
    Cat a;
    Cat b = a;
    Cat* p = new Cat();

    // 此时应当存在3个Cat个体
    cout << Cat::GetHowMany() << endl;

    delete p;
    // 此时应当存在2个Cat个体
    cout << Cat::GetHowMany() << endl;

    return 0;
}