7.5 Procedures and Functions

Question 1

Subroutines

Answer 1

Allow code that you intend to use a number of times to be grouped together under one name

Question 2

Give some examples of built-in subroutines

Answer 2

• print
• input
• int

Question 3

Procedures

Answer 3

Execute code in a subroutine but do not return anything (can have parameters)

Question 4

Functions

Answer 4

Execute code in a subroutine but return a value

Question 5

What are parameters?

Answer 5

Parameters are inputs to subroutines which can be used to affect the output or the process, for example, a parameter could be the age of a man or the name of a person

Question 6

Advantages to subroutines

Answer 6

• They are useful to break up a large program into self-contained units
• Improves code readability
• Improves code maintenance
• Improves workflow (reduces development time)
• Can be used in other programs

Question 7

What is the scope of a variable?

Answer 7

The scope determines where the variable can be used and recognised in the program

Question 8

Local scope

Answer 8

Variable can only be referenced and used where the instance was made (for example if it was initialised inside a function it can only be inside the function)

Question 9

Global scope

Answer 9

A variable that can be used anywhere in the code despite it being initiated in a closed and a local area (for example a function)

Question 10

Advantages of using local variables

Answer 10

Local variables keep a subroutine self-contained, so it can be used in any program without variable names conflicting with those used in the calling program