SLR 23

Question 1

What is Sequence?

Answer 1

Basic code of executing instructions one after another

Question 2

What is Selection?

Answer 2

Code which allows the program to change directions depending on the condition (e.g an if statement)

Question 3

What is Iteration?

Answer 3

Code which loops

Counter-Controlled Loops are for ‘for’ statements and a Condition-Controlled Loop is for ‘while, do and repeat until’ statements

Question 4

What is recursion?

Answer 4

When a subroutine (or function) calls itself within its block

Question 5

What do recursive subroutines require?

Answer 5

-A stopping condition
-An input value other than the stopping condition
-There must be finite number of tries

Question 6

What does a variables scope mean?

Answer 6

A scope decides if a variable is a local or global variable

Question 7

What are the advantages of local variables?

Answer 7

Limited scope prevents changing other parts of the code accidentally, risks conflict of matching variable names

Question 8

What are the disadvantages of local variables?

Answer 8

Can’t be accessed outside its block, can become redundant if a local variable is declared in multiple other functions, names must be unique

Question 9

What are the advantages of global variables?

Answer 9

Can be accessed throughout the whole program, exists for the entirety of the programs execution, lets data be shared across multiple functions

Question 10

What are the disadvantages of global variables?

Answer 10

Can accidentally modify other parts of the code, can cause inefficient memory use if not managed properly, risk of data inconsistency if multiple functions effect the global variable

Question 11

What is a parameter?

Answer 11

A parameter is a special kind of variable used in a function to refer to one of the pieces of data provided as input to the function

Question 12

What does it mean by a parameter being passed by value?

Answer 12

A local copy of a variable is made in the subroutine the parameter belongs to

Question 13

What does it mean by a parameter being passed by reference?

Answer 13

A pointer that contains the memory address of the original variable, meaning the variable in the subroutine also effects the original variable

Question 14

What are the features of an IDE?

Answer 14

-Code Editors
-Error Diagnostics
-Runtime Environments
-Translators
-Auto-documentation
-Syntax Highlighting
-Autocompletion