从0学习C++ (九) 构造函数
#include <iostream>;using namespace std;/*类继承中的构造函数当Animal的构造函数变为Animal(int height,int weight)时，系统并不会为Animal生成默认构造函数。这个时候 Fish类的构造函数要变为：Fish(): Animal(100,200) --》其中的100 200为传入的参数。Fish类可以在构造的时候为常量 a 赋值。 Fish(): Animal(100,200),a(1) 其中1是给常量赋的值~Animal(){} 析构函数。 释放对象。*/class Animal{public:/*Animal(){cout << "Animal construct" << endl;}*/Animal(int height,int weight){cout << "Animal construct" << endl;}~Animal(){cout << "Animal deconstruct" << endl;}void eat(){cout << "Animal eat" << endl;}void sleep(){cout << "Animal sleep" << endl;}//虚函数virtual void breathe(){cout << "Animal breathe" << endl;}};class Fish : public Animal{private :const int a;public ://在构造函数中给常量赋值。Fish(): Animal(100,200),a(1){cout << "Fish construct" << endl;}~Fish(){cout << "Fish deconstruct" << endl;}void breathe(){cout << "fish bubble" << endl;}}; int main(){ Fish fish;return 0 ;} 