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第七章第五题感觉题目有点模糊，不懂究竟要干什么6.#include<iostream>#include<cstdio>using namespace std;class Mamal{ public:Mamal(){cout << "Calling Mamal construction" << endl;}~Mamal(){cout <<...

第四章8.#include<iostream>#include<cstdio>using namespace std;class Dog{ private:int age;double weight; public:Dog(int i, double j):age(i), weight(j){}void show(){ cout << "age:" &l...

第五章7. //7.#include<iostream>#include<cstdio>using namespace std;class Cat{ private:string s;static int numofCats; public:Cat(string i):s(i){numofCats++;}//~Cat(){numofCats--;}//本来想让它析构的...

5.  //第八章//5. #include<iostream>using namespace std;class Mammal{public:   virtual void speak(){cout<<"Don'tknow~"<<endl;}//virtual写一个就可以了，后面会直接引用};class Dog:public Mammal{public:   ...