中断实现的＂欢乐颂＂

    　　这是我用中断，通过对计数器的设置编写出的音乐程序，而不同直接调用函数＂sound"的．虽然还不完善，但也能听出是一首歌拉，哈哈．．．．要执行就在turboc里编译一下就行了．

    #include<stdio.h>
    #include<dos.h>
    int n=0,fg=0;
    int b;
    void soundkid(int x,int y)
    {
      int a;
      outportb(0x43,0xb6);
      outportb(0x42,x);
      outportb(0x42,y);
      a=inportb(0x61);
      a=a3;
      outportb(0x61,a);
    };
    void nosoundkid()
    {
      int a;
      a=inportb(0x61);
      a=a&0xfd;
      outportb(0x61,a);
    };
    void interrupt(*old)(void);
    void interrupt new()
    {
      switch(b)
        {
           case 1:soundkid(200,17);break;
           case 2:soundkid(216,15);break;
           case 3:soundkid(30,14);break;
           case 4:soundkid(109,13);break;
           case 5:soundkid(226,11);break;
           case 6:soundkid(150,10);break;
           case 7:soundkid(110,9);break;
           case 0:nosoundkid();break;
           case'e':nosoundkid();break;
           default:;
    }
       if(b!=0&b!='e')
        {
       n++;if(n>10){n=0;fg=1;}
        }
       else
        {n++;if(n>0){n=0;fg=1;}}
    };
    main()
    {
      int code[42]={3,0,3,4,5,0,5,4,3,2,1,0,1,2,3,0,3,2,0,2,3,0,3,4,5,0,5,4,3,2,1,0,1,2,3,2,1,0,1,0,1,'e'};
      int i;
      for(i=0;i<42;i++)
       {
         b=code[i];
         old=getvect(0x1C);
         setvect(0x1c,new);
         for(;;)
          {
            if(fg==1)
      {fg=0;setvect(0x1c,old);break;}
          }
        }
    }