虚函数，播放声音以及随机数的使用

虚函数，播放声音以及随机数的使用

#include <iostream>
using namespace std;
#include <time.h>
#include <cmath>
#include <windows.h>
#include <mmsystem.h>
#pragma comment(lib,"WINMM.LIB")//加上，不然PlaySound函数无法使用
class Music
{
public:
	Music(){/*cout<<"Music construction called"<<endl;*/}//构造函数不能用Virtual。
	virtual ~Music(){/*cout<<"Music destruction called"<<endl;*/}
	virtual void sound()=0;
};
class ring1:public Music
{
public:
	ring1(){}
	virtual ~ring1(){}
	virtual void sound()
	{
		cout<<"正在播放ring1......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring01.wav",NULL,0);
		system("cls");
	}
};
class ring2:public Music
{
public:
	ring2(){}
	virtual ~ring2(){}
	virtual void sound()
	{	
		cout<<"正在播放ring2......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring02.wav",NULL,0);
		system("cls");
	}
};
class ring3:public Music
{
public:
	ring3(){}
	virtual ~ring3(){}
	virtual void sound()
	{	
		cout<<"正在播放ring3......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring03.wav",NULL,0);
		system("cls");
	}
};
class ring4:public Music
{
public:
	ring4(){}
	virtual ~ring4(){}
	virtual void sound()
	{
		cout<<"正在播放ring4......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring04.wav",NULL,0);
		system("cls");
	}
};
class ring5:public Music
{
public:
	ring5(){}
	virtual ~ring5(){}
	virtual void sound()
	{
		cout<<"正在播放ring5......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring05.wav",NULL,0);
		system("cls");
	}
};
class ring6:public Music
{
public:
	ring6(){}
	virtual ~ring6(){}
	virtual void sound()
	{
		cout<<"正在播放ring6......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring06.wav",NULL,0);
		system("cls");
	}
};
class ring7:public Music
{
public:
	ring7(){}
	virtual ~ring7(){}
	virtual void sound()
	{
		cout<<"正在播放ring7......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring07.wav",NULL,0);
		system("cls");
	}
};
class ring8:public Music
{
public:
	ring8(){}
	virtual ~ring8(){}
	virtual void sound()
	{
		cout<<"正在播放ring8......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring08.wav",NULL,0);
		system("cls");
	}
};
class ring9:public Music
{
public:
	ring9(){}
	virtual ~ring9(){}
	virtual void sound()
	{
		cout<<"正在播放ring9......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring09.wav",NULL,0);
		system("cls");
	}
};
class ring10:public Music
{
public:
	ring10(){}
	virtual ~ring10(){}
	virtual void sound()
	{
		cout<<"正在播放ring10......"<<endl;
		PlaySoundA("C:\\Windows\\Media\\Ring10.wav",NULL,0);
		system("cls");
	}
};
void sound(Music *song)
{
	song->sound();
}
int main()
{
	Music* pt=NULL;
	for(int i=0;i<100;i++)
	{
		srand(time(NULL));
		int k=rand()%10+1;
		switch(k)
		{
		case 1:
			{
				pt=new ring1;
				sound(pt);
				delete pt;
			}break;
		case 2:
			{
				pt=new ring2;
				sound(pt);
				delete pt;
			}break;
		case 3:
			{
				pt=new ring3;
				sound(pt);
				delete pt;
			}break;
		case 4:
			{
				pt=new ring4;
				sound(pt);
				delete pt;
			}break;
		case 5:
			{
				pt=new ring5;
				sound(pt);
				delete pt;
			}break;
		case 6:
			{
				pt=new ring6;
				sound(pt);
				delete pt;
			}break;
		case 7:
			{
				pt=new ring7;
				sound(pt);
				delete pt;
			}break;
		case 8:
			{
				pt=new ring8;
				sound(pt);
				delete pt;
			}break;
		case 9:
			{
				pt=new ring9;
				sound(pt);
				delete pt;
			}break;
		case 10:
			{
				pt=new ring10;
				sound(pt);
				delete pt;
			}break;
		}
	}
	return 0;
}

结果