在输入信息时输错了，如何清除错误的输入？？？



/*
输入用户名和密码 登陆（密码或用户名出错超过3次，退出系统）
Right={201728,"FklqdGI74999defg"}
*/

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

#define Num 9
#define Len 16

char RightUserName[]={"20172834"};
char RightPassword[16]="ChinaDF41666abcd";
char EnterPassword[Len]={0};

char *GetPasswd(void)  
{  
    char d='\0';  
    int k= 0;  
      
    while ((d=getch()) != 13 && k<Len)  
    {  
        EnterPassword[k] = d;  
        putchar('*');  
        k++;   
    }  
    return(EnterPassword);  
}  

void main()
{
    int i=0;
    int j=0;
    int count=0;
    char c='\0';
    char EnterName[Num]={0};
    char *dispstr = NULL;  

    for(i=0;i<=15;i++)
    {
        RightPassword[i]=RightPassword[i]+3;
    }

    for(i=0;i<3;)
    {
        printf("请输入用户名：\r\n");
        scanf("%8s",EnterName);
        
        printf("请输入密码：\r\n");
        dispstr = GetPasswd();

        printf("\r\n");

        if(strcmp(EnterName,RightUserName)!=0
          ||strcmp(EnterPassword,RightPassword)!=0)
        {
            i++;
            count++;
            if(count>=3)
            {
                printf("输入出错已经3次，请一天后重试!");
            
                system("pause");
                break;
            }
            else
                printf("用户名或密码出错!请重新输入：\r\n");
        }
        else
        {
            printf("登陆成功!");
            
            system("pause");
            break;
        }
    }
   
}