Loops (While and Do-While) and logical operators (NOT, AND, OR)

Question 1

True or False?
Variables declared outside a loop can be accessed inside the loop
Variables declared inside a loop cannot be accessed outside the loop

Answer 1

True

Question 2

What is the output of the following code?

int counter = 2;
do {
    counter++;
    System.out.println("x");
}
while (counter < 6);

Answer 2

xxxx

Question 3

What applies to a ‘do-while’ loop, but not to a ‘while’ loop?

Answer 3

It is guaranteed that code within the loop will run at least once.

Question 4

Which of the following keywords can be used to exit the current iteration of the loop, and jump straight to the next iteration?

Answer 4

Continue

Question 5

Which of the following shows the correct syntax for the logical OR operator in Java?

Answer 5

||

Question 6

If a ‘while’ loop is used with a variable to keep a count of the number of times it has iterated, it must be declared when?

Answer 6

Prior to, and outside, the loop syntax

Question 7

Which of the following shows the correct syntax for the logical AND operator?

Answer 7

&&

Question 8

Consider the following code:

boolean a = true;
boolean b = false;
boolean c = true;

if (!b || !c) {
    System.out.print("x");
}
else{
    System.out.print("y");
}
if (c){
    System.out.print("z");
}

What would be output if the code was executed?

Answer 8

XZ

Question 9

Which keyword is used to completely exit a loop?

Answer 9

Break