Week 10 Part 2

Question 1

o Decision structures are meant to perform (or not perform) set(s) of statements ____, repetition structures are only used to perform one set of statement ________

Answer 1

 Once, repeatedly

Question 2

o A while loop is the ______ loop

Answer 2

 simplest

Question 3

o If the Boolean result is false for a while loop before it begins

Answer 3

 The body is skipped over and never executed

Question 4

o What is the best loop if you are not sure how many times the loop will need to repeat?

Answer 4

 While loop

Question 5

o A difference between a while loop and a do-while loop is that in a do while loop the body of the expression will always

Answer 5

 Execute at least once

Question 6

o Unlike other loops, this loop requires a semicolon after the condition

Answer 6

 Do-while loop, as no brace comes afterwards

Question 7

o When are for loops best used?

Answer 7

 Counted loops where you know how many repetitions are needed

Question 8

o The parts in the parenthesis of a for loop are optional, other than the ; . What happens if all parts are omitted?

Answer 8

 You will get an infinite loop

Question 9

o Will this run?
o For( ; index < 42 ; ){
index++; }

Answer 9

o Yes, works like a while loop (don’t do this though)

Question 10

o Just like if statements the _____ are optional if there’s only 1 statement. This is also a common mistake with loops

Answer 10

 Braces

Question 11

o What happens if we run these?
 For (expression) ; {}
while(expression);{}

Answer 11

 Infinite loop

Question 12

o A block of code is typically outlined with

Answer 12

 {}

Question 13

o Loops count as _____ code and variables inside them have a _____-_____ scope

Answer 13

 Block, block-level

Question 14

o It’s best practice to use _____ _____ variables whenever possible in all cases

Answer 14

 Local scope

Question 15

o The _____ and ________ keywords are controversial in java

Answer 15

 Break and continue

Question 16

o Break and continue can be used with _________ and _____. You usually see both of them ______ inside of ____

Answer 16

 Decisions and loops, nested, loops

Question 17

o The break keyword is typically used to

Answer 17

 End a loop early

Question 18

o In a loop, the continue keyword

Answer 18

 Causes the loop to return to the top, skipping any statements that were remaining within the loop

Question 19

o Labelled break and continue are rarely used, they are very controversial as they break the tenants of __________ ___________

Answer 19

 Structured programming

Question 20

o Identify this
o for(data_type variable : array_or_collection){
// statement(s)
}

Answer 20

 Enhanced for loop