模拟windows 日期/时间 的C程序

    #include<graphics.h>
    #include<stdio.h>
    #include<math.h>
    #include<dos.h>
    #define PI 3.1415926
    #define UP 0x4800
    #define DOWN 0x5000
    #define ESC 0x11b
    #define TAB 0xf09
    clock();
    date(int,int);
    int digitsec(double s)/*digital clock second*/
    {int i;
     for(i=0;i<=59;i++) if(s==i) return i;
     }
    int digithour(double h)/*digital clock hour*/
    {int i;
     for(i=0;i<=23;i++) if(h==i) return i;
     }
    int digitmin(double m)/*digital clock minute*/
    {int i;
     for(i=0;i<=59;i++) if(m==i) return i;
     }
    digitclock(int x,int y,int clock)/*整个digital clock*/
    {char buffer1[10];
     setfillstyle(0,2);
     bar(x,y,x+15,328);
     if(clock==60) clock=0;
     sprintf(buffer1,"%d",clock);
     outtextxy(x,y,buffer1);
     }
    cursor(int count)    /*画一个光标函数*/
    {switch(count)
     {case 1:line(156,108,156,118);break;
      case 2:line(280,108,280,118);break;
      case 3:line(424,315,424,325);break;
      case 4:line(465,315,465,325);break;
      case 5:line(505,315,505,325);break;
      }
     }
    clear(int count)    /*清除光标函数*/

    {switch(count)
     {case 2:line(156,108,156,118);break;
      case 3:line(280,108,280,118);break;
      case 4:line(424,315,424,325);break;
      case 5:line(465,315,465,325);break;
      case 1:line(505,315,505,325);break;
      }
     }
    int key(int,int);
    int dateupchange(int);
    int datedownchange(int);
    int timeupchange(int);
    int timedownchange(int);
    double h,m,s;
    double x,x1,x2,y,y1,y2;
    char buffer[80];
    strUCt time t[1];
    struct date da[1];
    main()
    {int driver, mode=0,i,j;
     int year,mon;
     char *month[]={"SUN","MON","TUE","WEN","THU","FRI","SAT"};
     driver=DETECT;
     initgraph(&driver, &mode, "");
     setlinestyle(0,0,3);
     setbkcolor(0);
     setcolor(7);
     line(82,430,558,430);
     line(70,62,70,418);
     line(82,50,558,50);
     line(570,62,570,418);
     line(70,62,570,62);
     line(76,56,297,56);
     line(340,56,564,56);  /*画主体框架*/
     setlinestyle(0,0,3);
     arc(82,62,90,180,12);
     setlinestyle(0,0,3);
     arc(558,62,0,90,12);
     setlinestyle(0,0,3);
     arc(82,418,180,279,12);
     setlinestyle(0,0,3);
     arc(558,418,270,360,12);   /*画边角*/
     setcolor(15);
     outtextxy(300,53,"CLOCK"); /*总标题*/
     setcolor(7);
     rectangle(80,72,332,360);  /*月历的框架*/
     rectangle(342,72,560,360); /*时钟的框架*/
     for(j=78;j<=84;j+=6)
     line(80,j,332,j);