ChangePassword()//修改密码
{
    system("cls");
    printf("\n\n");
    system("color 02");
    FILE *fp;
    struct user su;
    char p[10];int i=0;char ch;
    void encrypt(char *pwd);//加密算法
    printf("请输入当前用户名：");
    scanf("%s",su.username);
    printf("     请输入新密码：");
    while((p[i]=getch())!='\r')
    {
        if(p[i]==13)break;
        if(p[i]!='\b')
        {
            printf("*");
            i++;
        }
        else{
            printf("\b\b");
            i--;
        }
    }
    p[i]='\0';
    printf("\n");
    fscanf(fp,"%s",su.password);
    printf("\n确定修改密码？\nY.是\nN.否");
    scanf("%c",&ch);
    if(ch=='Y')
    {
       strcpy(su.password,p);
       encrypt(su.password);
       fp=fopen("f:\\usermessage","w+");
       fprintf(fp,"%s",su.password);
       if(!fclose(fp))printf("\n修改成功！\n");
       else printf("\n密码修改失败\n");
    }
    else printf("\n暂不修改密码！\n");
}