User login

0 introduction

In our daily life , Many times, users have to log in .

1 problem

Enter your username and password , Determine whether the user name and password are correct （’name’=’root’,’password’=’1234’）. In order to prevent violent cracking , There are only three login opportunities , If there are more than three opportunities to report errors .

2 Method

use for There are only three login opportunities when the account name or password is wrong , Then use conditional statements , If the user name and password entered are correct , Just use break Stop the cycle . If you enter the wrong user name or password , Just continue typing , If you report an error more than three times .

3 Experimental results and discussion

Through the experiment 、 Practice has proved that the proposed method is effective , Is able to solve the problem raised at the beginning .

Code list 1

4 Conclusion

Loop and conditional sentences are used in this problem , Use the loop to design the user login system , Limit user login times to prevent forced login , It ensures the security of the user's account , It is of great significance .