程序代码：

#include<stdio.h>
#include<conio.h>
#include "windows.h" 

#define ORG_X 20
#define ORG_Y 3
/*
**定义账号,密码最大位数
*/
#define HMAX 10
#define PMAX 10
/*
**定义账号,密码
*/
#define HH "2007121148"
#define PP "771691"



int main(void)
{
    int password(void);

    if( 1==password() )
    {
        printf("欢迎!\n");
    }
    else
    {
        printf("非法用户!\n");
    }
    return 0;
}




void gotoxy(int x,int y)
{ 
    COORD c; 
    c.X=x-1; 
    c.Y=y-1; 
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),c); 
} 


int password(void)
{
    int h_x,p_x,now_y; /*h_x,p_x,now_y当前帐号,密码,行光标位置*/
    int count_h=0,count_p=0;/*已输入帐号,密码个数*/
    char ch;
    char h[HMAX+1],p[PMAX+1];/*保存账号,密码*/


    p_x=h_x=ORG_X;
    now_y=ORG_Y;

    gotoxy(ORG_X-5,ORG_Y+1);
    printf("密码:");

    gotoxy(ORG_X-5,ORG_Y);
    printf("帐号:");


    while((ch=getch())!=13)
    {

        /*
        **处理切换
        */
        if( ('\t'==ch) && ORG_Y==now_y )
        {
            now_y+=1;
            gotoxy(p_x,now_y);
            continue;
        }

        if( ('\t'==ch) && ORG_Y+1==now_y)
        {
            now_y-=1;
            gotoxy(h_x,now_y);
            continue;
        }

        /*
        **处理删除
        */
        if( ((char)8==ch) && h_x>ORG_X && ORG_Y==now_y  )
        {
            h[ORG_X - h_x]=0;
            h_x--;
            count_h--;
            gotoxy(h_x,now_y);
            printf(" ");            
            gotoxy(h_x,now_y);
            continue;
        }
        
        if( ((char)8==ch) && p_x>ORG_X && ORG_Y+1==now_y )
        {
            p[ORG_X - p_x]=0;
            p_x--;
            count_p--;
            gotoxy(p_x,now_y);
            printf(" ");
            gotoxy(p_x,now_y);
            continue;

        }
        /*
        **处理输入
        */

        if(ORG_Y==now_y && count_h<HMAX && ch!=8)
        {
            h[h_x - ORG_X]=ch;
            printf("%c",ch);
            h_x++;
            count_h++;
        }

        if(ORG_Y+1==now_y && count_p<PMAX && ch!=8)
        {
            p[p_x - ORG_X]=ch;
            printf("*");
            p_x++;
            count_p++;
        }
    }

    p[p_x-ORG_X]=0;
    printf("\n");
    h[h_x-ORG_X]=0;

    /*
    **验证密码
    */
    if( 0==strcmp(h,HH) )
    {    
        if( 0==strcmp(p,PP) )
        {
            system("cls");
            return 1;
        }
    }
    system("cls");

    return 0;
}