程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <dos.h>

void PrintVer(int,int,char*);
void PrintHor(int,int,char*);
void PrintNumbers(int,char*);

/*LCD的字型码*/

/*   -0-
    1   2
     -3-
    4   5
     -6-        */

int LCDCODES[][7]=
{                 /* char asiic figure */
    {1,1,1,0,1,1,1},/* '0' 0x30 0 */
    {0,0,1,0,0,1,0},/* '1' 0x31 1 */
    {1,0,1,1,1,0,1},/* '2' 0x32 2 */
    {1,0,1,1,0,1,1},/* '3' 0x33 3 */
    {0,1,1,1,0,1,0},/* '4' 0x34 4 */
    {1,1,0,1,0,1,1},/* '5' 0x35 5 */
    {1,1,0,1,1,1,1},/* '6' 0x36 6 */
    {1,0,1,0,0,1,0},/* '7' 0x37 7 */
    {1,1,1,1,1,1,1},/* '8' 0x38 8 */
    {1,1,1,1,0,1,1},/* '9' 0x39 9 */
    {0,0,0,1,0,0,0},/* ':' 0x3A - */
    {0,0,0,0,0,0,0} /* ';' 0x3B   */
};

char c_ver='|';
char c_hor='-';

/* 两个相邻字母中间隔了一个空列 ，因此平均每个字母占据n+3列，最后一列为间隔 */
/* 打印竖直笔画，n-笔画长度，section=1或者4，numbers-数字字符串 */
void PrintVer(int n,int section,char *numbers)
{
    char *line;
    int i,len=(n+3)*strlen(numbers);
    line=(char*)malloc(len+1);
    if(line==NULL)
        return;
    memset(line,' ',len);
    for(i=0;i<strlen(numbers);i++)
    {
        if(LCDCODES[*(numbers+i)-'0'][section])
            *(line+(n+3)*i)=c_ver;
        if(LCDCODES[*(numbers+i)-'0'][section+1])
            *(line+(n+3)*i+(n+1))=c_ver;
    }

    /*检查最后一个字符，如果没有笔画，要使\0前移2格！*/
    line[len-1]='\0';
    /*打印n行*/
    for(i=0;i<n;i++)
        printf("%s\n",line);
    free(line);
}

/*打印水平笔画，n-笔画长度，section=0，3，or 6，numbers-数字字符串*/
void PrintHor(int n,int section,char *numbers)
{
    char *line;
    int i,len=(n+3)*strlen(numbers);
    line=(char*)malloc(len+1);
    if(line==NULL)
        return;
    memset(line,' ',len);

    for(i=0;i<strlen(numbers);i++)
    {
        if(LCDCODES[*(numbers+i)-'0'][section])
            memset((line+(n+3)*i+1),c_hor,n);
    }

    /*注意最后一个数字后面无需空格了！所以多缩进一个位置*/
    line[len-1]='\0';
    /*打印1行*/
    printf("%s\n",line);
    free(line);
}

/* Print A set of Numbers : "23456" e.g. */
void PrintNumbers(int n,char *numbers)
{
    PrintHor(n,0,numbers);    /*  ----    */
    PrintVer(n,1,numbers);    /* |    |    */
    PrintHor(n,3,numbers);    /*  ----    */
    PrintVer(n,4,numbers);    /* |    |    */
    PrintHor(n,6,numbers);    /*  ----    */
}

/*用LCD样式显示当前的Bios时间*/
int main()
{
    char buffer[10];
    int n=2;                 /* 笔画长度 */
    int lastSec=-1; /* 缓存秒 */
    struct time curTime; /* bios时间 */
    textbackground(BLACK);
    textcolor(WHITE);
    clrscr();
    while(!kbhit())
    {
        gettime(&curTime);
        if(curTime.ti_sec!=lastSec)
        {
            /* %2d：正数表示右对齐, 0表示补零，仅右对齐时有效 */
            sprintf(buffer,"%2d:%02d:%02d", curTime.ti_hour, curTime.ti_min, curTime.ti_sec);
            gotoxy(1,2);
            PrintNumbers(n,buffer);
            lastSec=curTime.ti_sec;
        }
        delay(200);
    }
}