Topic description
When you try to log in to a system but forget your password, the system generally only allows you to try a limited number of times. When the number of allowed times is exceeded, the account will be locked.
This question asks you to implement this small function.
Input format
Enter a password and a positive integer N on the first line, which are the correct password and the number of attempts allowed by the system.
Each subsequent line gives a non-empty string ending with a carriage return, which is the password that the user is trying to enter.
When only a single read line #when the character input end, and this line is not the user's input.
The input is guaranteed to have at least one attempt.
The password is a non-empty string of no more than 20, no spaces, Tab, or carriage return
Output format
For each input of the user,
- If it is the correct password and the number of attempts does not exceed N, output in one line
Welcome inand end the program; - If it is wrong, output in the format in one line
Wrong password: 用户输入的错误密码; - When the number of error attempts reaches N times, another line is output
Account lockedand the program ends.
Input example 1
Correct%pw 3
correct%pw
Correct@PW
whatisthepassword!
Correct%pw
输出样例1
Wrong password: correct%pw
Wrong password: Correct@PW
Wrong password: whatisthepassword!
Account locked
Input sample 2
cool@gplt 3
coolman@gplt
coollady@gplt
cool@gplt
try again
Output sample 2
Wrong password: coolman@gplt
Wrong password: coollady@gplt
Welcome in
Data range
N ≤ 10
Problem solution
simulation:
细节: If the number is read when the first row, a second row with a getlineread into the string, with the first getcharfiltered off 换行, otherwise it will read a blank line;
#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
int limit;
string password, str;
cin >> password >> limit;
getchar(); // 过滤换行
int cnt = 0;
while(getline(cin, str), str != "#")
{
if(str == password)
{
cout << "Welcome in" << endl;
break;
}
else
{
cnt ++;
cout << "Wrong password: " << str << endl;
if(cnt == limit)
{
cout << "Account locked" << endl;
break;
}
}
}
return 0;
}