Intro to Java Day 11 Homework

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Email *

Record my email address with my response

What is a sentinel value? *

1 point

A variable that is essential to have in the code

A value of input that indicates the end of input

A value of input that is necessary in order for the program to run

A value of input that is unneeded when the user can input as much as they want.

Which of the following are correct headers for a while loop? Assume x is an integer variable. *

1 point

while (int i=0; i<5; i++)

while (int i=0, i<5, i++)

while (x<=5)

while (x==true)

All of the above

How many times will this code run?

int count = 1;
while (count <= 5){
System.out.println (count);
count++;
} *

1 point

0, this code has an error

None of the above

Please find the EXACT outputs of these code segments without putting the code in your IDE. Go to the next line when necessary and if there is an infinite loop, say so.

Part a *

1 point

Part b *

1 point

Part c *

1 point

Programming question

Create a login program that checks username and password. The user can have as many attempts as they want. If the user got the correct username and password combination, print “Successful login!” and end the program.

Suppose the username is "Javalover123" and password is "javanumber1" (without quotes)

Hint: use 2 sentinel values, except both have to be correct (if either one are wrong, it is not a successful login)

Submit your code here.

1 point

(Optional) Add two additional user logins to your program (you may create your own usernames/passwords).

Submit your updated code here.

0 points

Add a security feature where there are a maximum number of failed attempts (let's say 5 attempts) before the system locks the login process (print “You have reached your maximum attempts to log in.” and end program).

Hint: count how many times the user inputted and possibly use a break statement.

Submit your updated code here.

1 point

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