AS SSD Program Control Structures

Question 1

How does a program run?

Answer 1

It runs in sequence.

Question 2

What is used to disrupt the sequence of a program?

Answer 2

Methods are used.

Question 3

What must a method have?

Answer 3

It must have a name an a body of code.

Question 4

How it code within a method executed?

Answer 4

Code within a method is executed in sequence.

Question 5

Where should every method be called?

Answer 5

In the predefined “Main” method.

Question 6

What is repetition?

Answer 6

Repetition, which is also called iteration is the idea of repeating blocks of code a certain number of times or until a condition is met.

Question 7

What are the 4 main types of iteration?

Answer 7

For, While, Do-While and For-Each.

Question 8

When should a For Loop be used?

Answer 8

A For Loop can be used if the number of iterations of the loop is known to the user.

Question 9

What is a for-each loop?

Answer 9

A for-each loop will execute some code depending on how many items are in a data structure, such as a list or array.

Question 10

What is not a requirement when using a for-each loop?

Answer 10

It is not a requirement to know how many times you have to loop through a list or array.

Question 11

What is a while loop?

Answer 11

A while loop will repeat something until a condition is met. These are most useful when you aren’t sure how many times something has to be repeated.

Question 12

What logical operators can be used in a while loop?

Answer 12

Any logical operator can be used and it can also have single or multiple conditions.

Question 13

What is a do-while loop?

Answer 13

A do-while loop will always ensure that the code inside the loop will execute at least once before checking the condition.

Question 14

What is a do-while loop considered as?

Answer 14

It is considered as a “post-test” loop as it checks the condition after running the code once.

Question 15

What is an if statement?

Answer 15

An if statement is used when there are multiple conditions which must be checked and one of which must be true in order to execute a price of code.

Question 16

What is this logical operator?

Answer 16

Equal to

Question 17

What is this logical operators?
!=

Answer 17

Not equal to

Question 18

What is this logical operators?
>

Answer 18

Greater than

Question 19

What is this logical operator?
>=

Answer 19

Greater than or equal to

Question 20

What is this logical operators?
<

Answer 20

Less than

Question 21

What is this logical operators?
<=

Answer 21

Less than or equal to

Question 22

What is this logical operators?
&&

Answer 22

And

Question 23

What is this logical operators?
||

Answer 23

Or

Question 24

Why might you use a nested if statement?

Answer 24

It allows you to control the program flow within an if statement.

Question 25

What is a switch statement?

Answer 25

A switch statement will execute a condition depending on a condition. It would be considered less complicated to write and to logically follow than an if statement.

Question 26

What happens if not case value matches the switch value?

Answer 26

Then the default output message is outputted to the console.