本文主要是介绍026 编程填空:统计动物数量,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
#include <iostream>
using namespace std;
class Animal {
public:
static int number;
virtual ~Animal() {
}
};
class Dog:public Animal {
public:
static int number;
Dog() {
++Animal::number;
++number;
}
~Dog() {
--Animal::number;
--number;
}
};
class Cat:public Animal {
public:
static int number;
Cat() {
++Animal::number;
++number;
}
virtual ~Cat() {
--Animal::number;
--number;
}
};
int Animal::number = 0;
int Dog::number = 0;
int Cat::number = 0;
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();
}
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