// 登录界面 第一次可设置密码 之后的登录要输入密码进行验证 密码长度8~12
#include<stdio.h>
#include<ctype.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>
#include<Windows.h>
#define LEN 12
static int count=0;
int main(){
char password[LEN+1];
memset(password,NULL,LEN+1);
char ch;
if(count==0){
loop_passwordSet:printf("this is your first time to login,pls set your password.\n");
printf("the length of password has a length between 8~12 without any nonprint charators.\n");
int inputLength=0;
ch=getch();
while(isprint(ch)){
if(ch!=' '){
putchar('*');
password[inputLength]=ch;
inputLength++;
ch=getch();
}
if(!isprint(ch))
break;
if(inputLength==LEN)
break;
}
printf("\n");
printf("what you have just input is: %s\n",password);
printf("Press Y/N to confirm.\n");
ch=getch();
switch(ch){
case 'Y' :{
printf("password set completed!\n");
count=1;
break;
}
case 'y' :{
printf("password set completed!\n");
count=1;
break;
}
case 'N': {
printf("password set canceled.\n");
goto loop_passwordSet;
}
case 'n': {
printf("password set canceled.\n");
goto loop_passwordSet;
}
default: {
printf("invalid input,pls try again.\n");
goto loop_passwordSet;
}
}
}
if(count==1){
char toMatchPassword[LEN+1];
memset(toMatchPassword,NULL,LEN+1);
int toMatchLength=0;
loop_inputPassword:
printf("input your password to login.\n");
ch=getch();
while(isprint(ch)){
if(ch!=' '){
putchar('*');
toMatchPassword[toMatchLength]=ch;
ch=getch();
toMatchLength++;
}
if(!isprint(ch)){
break;
}
if(toMatchLength==LEN){
break;
}
}
if(strcmp(password,toMatchPassword)==0){
printf("password Correct! LOGIN SUCCESS!\n");
printf("**********************\n");
printf("**********************\n");
printf("** WELCOME **\n");
printf("**********************\n");
printf("**********************\n");
printf("*********** By ZHAOs*\n");
Sleep(2000);
}
if(strcmp(password,toMatchPassword)!=0){
printf("Password input error! Press Y to try again!\n");
char ch=getch();
switch(ch){
case 'Y':{
goto loop_inputPassword;
}
case 'y':{
goto loop_inputPassword;
}
case 'N':{
exit(0);
}
case 'n':{
exit(0);
}
default:
{
printf("invalid input, now the system would abort....\n");
Sleep(2000);
exit(0);
}
}
}
}
system("pause");
return 0;
}