Programming Constructs

Question 1

What is Sequence?

Answer 1

A series of steps which are completed one after the other. In a flow diagram they are shown as process, input and output symbols shown one after the other.

Question 2

What is Selection?

Answer 2

The ability to choose different paths through a program. In flowcharts, decision symbols are used for selection.

Question 3

What is Iteration?

Answer 3

Repeating a part of a program. It is also referred to as repeating or looping. In flowcharts, iteration is shown using arrows that repeat a section of the flowchart and a decision will control more iterations are required.

Question 4

Understanding Sequence

Answer 4

01 - First of all do this line of code
02 - Now do this one
03 - Now do this one
04 - Now do this one
05 - And this one
06 - And finally this one

Question 5

Understanding Selection

Answer 5

01 - First of all do this line of code 
02 - Now do this one
03 - IF (Age > 18) THEN
04 - Do this line of code
05 - And now this one
06 -And now this one  
07 - ELSE
08 - Do this line of code
09 - And now this one  
10 - And now this one

Question 6

Which two sub categories does iteration fall into?

Answer 6

1) Count Controlled Loops (run a set number of times)

2) Condition Controlled Loops (run forever - or until a condition is met)

Question 7

Understanding Iteration - Count Controlled Loops

Answer 7

01 - First of all do this line of code 
02 - Now do this one
03 - For 1 to 10 time DO
04 - Do this line of code
05 - And now this one
06 -And now this one  
07 - And now this one
08 - END LOOP
09 - Now do this line  
10 - And finally this one

Question 8

Understanding Iteration - Condition Controlled Loops

Answer 8

01 - First of all do this line of code 
02 - Now do this one
03 - REPEAT all the lines of code below
04 - This one
05 - And this one
06 -And this one  
07 - And this one
08 - UNTIL (Age > 18)
09 - Now do this line  
10 - And finally this one