Question

一个C++的程序简单填空题（统计动物数量）

#include <iostream>
using namespace std;
// 在此处补充你的代码
void print() {
cout << Animal::number << " animals in the zoo, " << Dog::number << " of them are dogs, " << Cat::number << " of them are cats" << endl;
}

int main() {
print();
Dog d1, d2;
Cat c1;
print();
Dog* d3 = new Dog();
Animal* c2 = new Cat;
Cat* c3 = new Cat;
print();
delete c3;
delete c2;
delete d3;
print();
}
/*
样例输入
None
样例输出
0 animals in the zoo, 0 of them are dogs, 0 of them are cats
3 animals in the zoo, 2 of them are dogs, 1 of them are cats
6 animals in the zoo, 3 of them are dogs, 3 of them are cats
3 animals in the zoo, 2 of them are dogs, 1 of them are cats
*/

Answer 1

这题主要是看类的继承，静态变量和虚函数的使用，代码如下

Answer 2

主要是应用类的继承，析构函数，静态变量等知识点，答案请看另一提问