Example 6

Task:
Prompted to enter a user id and password if id and password is correct then the user will view the first entry is required, otherwise the process is repeated from the beginning to user id and password are correct.
Code:

id,password : string

begin
repeat
input id 
input password
   until 
   id = 'username' and  password = '123'
   print('You have entered the main page')
end.