struct和class的区别

class中变量默认是private，struct中的变量默认是public，其他两个均相似，可以有构造函数析构函数，也可以继承。

#include <iostream>
using namespace std;
enum BREED {GOLDEN,CAIRN,DANDIE,SHETLAND,DOBERMAN,LAB};
struct Mammal
{
public:
Mammal():itsAge(2),itsWeight(5){}
~Mammal() {}

int GetAge() const {return itsAge;}
void SetAge(int age) {itsAge = age;}
int GetWeight() const {return itsWeight;}
void SetWeight(int weight) {itsWeight = weight;}

void Speak() const {cout<<"\nMammal sound!";}
void Sleep() const {cout<<"\nShhh.I'm sleeping.";}
protected:
int itsAgel;
int itsWeight;
};
struct Dog:public Mammal
{
public:
Dog():itsBreed(GOLDEN){}
~Dog(){}
BREED GetBreed() const {return itsBreed;}
void SetBreed(BREED breed) {itsBread = breed;}
void WagTail() const {cout<<"Tail wagging...\n";}
void BegForFood() const {cout<<"Begging for food...\n";}
private:
BREED itsBreed;
};
int main()
{
Dog fido;
fido.Speak();
fido.WagTail();
cout<<"Fido is"<<fido.GetAge()<<"years old \n";
return 0;
}