模拟电子时钟的程序【c语言吧】

算法：将当前时间显示到屏幕，当时间发生变化时，清屏，显示新的时间（当有键盘操作时退出程序）。
显示时间格式：小时：分钟：秒

/* DEV C++  Win XP*/
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <time.h>

typedef struct
{
     int x;
     int y;
}Point;

time_t now;
struct tm *pt,t1,t2;

int printpoint(Point p)
{
     Point p1;
     p1.x=p.x+2;  p1.y=p.y+4;
     gotoxy(p1.x,p1.y);     printf("%c%c",2,2);
     gotoxy(p1.x, p1.y+1);   printf("%c%c",2,2);
     p1.y+=4;
     gotoxy(p1.x,p1.y);     printf("%c%c",2,2);
     gotoxy(p1.x,p1.y+1);   printf("%c%c",2,2);
     return 0;
}

int print0(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0||i==12)
                printf("%c%c%c%c%c%c",2,2,2,2,2,2);
          else
                printf("%c%4s%c",2," ",2);
     }
     return 0;
}

int print1(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          printf("%5s%c"," ",2);
     }
     return 0;
}

int print2(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0||i==6||i==12)
                printf("%c%c%c%c%c%c",2,2,2,2,2,2);
          else if(i>0&&i<6)
               printf("%5s%c"," ",2);
               else
                printf("%c",2);
     }
     return 0;
}

int print3(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0||i==6||i==12)
                printf("%c%c%c%c%c%c",2,2,2,2,2,2);
          else
                printf("%5s%c"," ",2);
     }
     return 0;
}

int print4(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i<6)  printf("%c%4s%c",2," ",2);
          else if(i==6)
                    printf("%c%c%c%c%c%c",2,2,2,2,2,2);
               else printf("%5s%c"," ",2);
     }
     return 0;
}

int print5(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0||i==6||i==12)
                printf("%c%c%c%c%c%c",2,2,2,2,2,2);
          else if(i>0&&i<6)
                printf("%c",2);
               else
                printf("%5s%c"," ",2);
     }
     return 0;
}

int print6(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0||i==6||i==12)
                printf("%c%c%c%c%c%c",2,2,2,2,2,2);
          else if(i>0&&i<6)
                printf("%c",2);
               else
                printf("%c%4s%c",2," ",2);
     }
     return 0;
}

int print7(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0)   printf("%c%c%c%c%c%c",2,2,2,2,2,2);
          else       printf("%5s%c"," ",2);
     }
     return 0;
}

int print8(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0||i==6||i==12)
                printf("%c%c%c%c%c%c",2,2,2,2,2,2);

          else  printf("%c%4s%c",2," ",2);
     }
     return 0;
}

int print9(Point p)
{
     int i=0;
     for(;i<13;i++)
     {
          gotoxy(p.x+1, p.y+i);
          if(i==0||i==6||i==12)
                printf("%c%c%c%c%c%c",2,2,2,2,2,2);
          else if(i>0&&i<6)
                printf("%c%4s%c",2," ",2);

               else
                printf("%5s%c"," ",2);
     }
     return 0;
}

int clear(Point p)
{
     int i=0;
     for(;i<13;i++)
     gotoxy(p.x,p.y+i); printf("%16s"," ");
     return 0;
}

int printtime(Point p, int n)
{
     int a,b;
     Point pp;
     a=n/10, b=n%10;
     pp.x=p.x+8, pp.y=p.y;
     switch(a)
     {
         case 0: print0(p); break;
         case 1: print1(p); break;
         case 2: print2(p); break;
         case 3: print3(p); break;
         case 4: print4(p); break;
         case 5: print5(p); break;
    }
    switch(b)
    {
         case 0: print0(pp); break;
         case 1: print1(pp); break;
         case 2: print2(pp); break;
         case 3: print3(pp); break;
         case 4: print4(pp); break;
         case 5: print5(pp); break;
         case 6: print6(pp); break;
         case 7: print7(pp); break;
         case 8: print8(pp); break;
         case 9: print9(pp); break;
    }
    return 0;
}

int main()
{
      Point phour, pmin, psec,point1,point2;
      phour.x=9, pmin.x=32, psec.x=55;
      phour.y=pmin.y=psec.y=7;
      point1.x=25, point2.x=49;
      point1.y=point2.y=7;

      clrscr();
      textbackground(BLUE);
      textcolor(YELLOW);
      now=time(0);
      pt=localtime(&now);
      t1=*pt;
      printtime(phour, t1.tm_hour);
      printpoint(point1);
      printtime(pmin, t1.tm_min);
      printpoint(point2);
      printtime(psec, t1.tm_sec);
      while(1)
      {
           now=time(0);
       pt=localtime(&now);
           t2=*pt;
           if(t2.tm_sec!=t1.tm_sec)
           {
             t1=t2;
             clrscr();
             printtime(phour, t1.tm_hour);
             printpoint(point1);
             printtime(pmin, t1.tm_min);
             printpoint(point2);
             printtime(psec, t1.tm_sec);
           }
           if(bioskey(1)==0) continue;
           else exit(0);
      }

      return 0;
}