问题描述
- 初学者一个关于类的问题
-
编译,链接都没有问题.没有得到想要结果,我找不出错在哪,请大家帮看看头文件
# include <string> using namespace std; # include <iostream> # include <vector> class Animal { public: Animal (const char*n): name(n) {} virtual ~Animal() {} virtual void read ()=0; protected: string name; }; class Panda:public Animal { friend class Zoo; public: Panda (const char*n): Animal(n) {} void read () { cout<<"name "<<name<<" " <<"speices panda"<<endl; } }; class Tiger:public Animal { friend class Zoo; public: Tiger (const char*n): Animal(n) {} void read () { cout<<"name "<<name<<" " <<"speices tiger"<<endl; } }; class Monkey:public Animal { friend class Zoo; public: Monkey (const char*n): Animal(n) {} void read () { cout<<"name "<<name<<" " <<"speices monkey"<<endl; } }; class Zoo { public: Zoo(): contain(0) {} Zoo(int c): contain(c), room(c){} void ListAnimals(); int Accept(Animal*); void Release (int); ~Zoo(); private: int contain; vector<Animal*> room; }; ================================================== # include "Animal.h" using namespace std; int Zoo::Accept(Animal* one) { vector<Animal*>::size_type i=0; Animal* record =one; room.push_back(record); i = room.size(); return i; } void Zoo::Release(int p) { room[p] = 0; } void Zoo::ListAnimals() { int count = 0; for(int i=0;i<contain;++i) { if(room[i] != 0) { room[i]->read; cout<<"position "<<i<<endl; ++count; } } cout<<"toatl animals are "<<count<<endl; } Zoo::~Zoo() { for(int j=0;j<contain;++j) { if(room[j]!=0) { delete room[j]; } } }# include "Animal.h" using namespace std; int main() { Panda p[1]={Panda("Rudy")}; Tiger t[2]={Tiger("Sam"),Tiger("Princess")}; Monkey m[3]={Monkey("Nancy"),Monkey("CaroLine"),Monkey("Bob")}; Zoo Z(10); //初始化动物园对象，其最多可饲养10只动物，缺省饲养了0只动物 for(int i=0;i<2;i++) { Z.Accept(&t[i]); //向动物园移入要饲养的动物，并返回该动物所在的位置 Z.Accept(&m[i]); } int position=Z.Accept(&p[1]); Z.ListAnimals(); //列出动物园当前饲养了多少只动物, 每只动物所在的位置及其种类和姓名 Z.Release(position); //从动物园移走指定位置的动物 Z.ListAnimals(); Z.Accept(&m[2]); Z.ListAnimals(); return 0; }
解决方案
倒数第7行应该是p[0]
解决方案二：
#if 1
include
include
include
using namespace std;
class Animal
{
public:
Animal(const char*n) : name(n) {}
virtual ~Animal() {}
virtual void read() = 0;
protected:
string name;
};
class Panda :public Animal
{
friend class Zoo;
public:
Panda(const char*n) : Animal(n) {}
void read()
{
cout << "name " << name << " "
<< "speices panda" << endl;
}
};
class Tiger :public Animal
{
friend class Zoo;
public:
Tiger(const char*n) : Animal(n) {}
void read()
{
cout << "name " << name << " "
<< "speices tiger" << endl;
}
};
class Monkey :public Animal
{
friend class Zoo;
public:
Monkey(const char*n) : Animal(n) {}
void read()
{
cout << "name " << name << " "
<< "speices monkey" << endl;
}
};
class Zoo
{
public:
Zoo() : contain(0) {}
Zoo(int c) : contain(c), room(c){}
void ListAnimals();
int Accept(Animal*);
void Release(int);
~Zoo();
private:
int contain;
vector room;
};
int Zoo::Accept(Animal* one)
{
vector::size_type i = 0;
Animal* record = one;
room.push_back(record);
i = room.size();
return i;
}
void Zoo::Release(int p)
{
/*你用的vector,他是c++标准模版库的类，它提供了自己的迭代器*/
//room[p] = 0;
int i = 0;
for (vector::iterator iter = room.begin(); iter != room.end() && i++ <= p; iter++)
{
*iter = 0;
}
}
void Zoo::ListAnimals()
{
int count = 0;
for (int i = 0; i
{
if (room[i] != 0)
{
room[i]->read();
cout << "position " << i << endl;
++count;
}
}
cout << "toatl animals are " << count << endl;
}
Zoo::~Zoo()
{
for (int j = 0; j<contain; ++j)
{
if (room[j] != 0)
{
delete room[j];
}
}
}
int main()
{
Panda p[1] = { Panda("Rudy") };
Tiger t[2] = { Tiger("Sam"), Tiger("Princess") };
Monkey m[3] = { Monkey("Nancy"), Monkey("CaroLine"), Monkey("Bob") };
Zoo Z(10); //初始化动物园对象，其最多可饲养10只动物，缺省饲养了0只动物
for (int i = 0; i<2; i++)
{
Z.Accept(&t[i]); //向动物园移入要饲养的动物，并返回该动物所在的位置
Z.Accept(&m[i]);
}
int position = Z.Accept(&p[1]);
Z.ListAnimals(); //列出动物园当前饲养了多少只动物, 每只动物所在的位置及其种类和姓名
Z.Release(position); //从动物园移走指定位置的动物
Z.ListAnimals();
Z.Accept(&m[2]);
Z.ListAnimals();
return 0;
}
#endif