Section 1 Chapter 5 - Subroutines

Question 1

Subroutine

Answer 1

A block of code which performs a specific task within a program

Question 2

Function

Answer 2

A subroutine which returns a single or multiple values

Question 3

Procedure

Answer 3

A subroutine that does not return a value

Question 4

Global Variable

Answer 4

Variable that can be used anywhere in the program

Question 5

Local Variable

Answer 5

Variable that can only be in a subprogram and only exist during the execution of the subprogram

Question 6

Modular Programming

Answer 6

A ‘top down’ method of programming in which the problem is broken down into a number of subtasks

Question 7

Advantages of using subroutines (2)

Answer 7

• Splits the program into simpler tasks

- Reduces duplicate code

Question 8

The use of parameters

Answer 8

Allows different parts of the program to pass data without the use of global variables

Question 9

Subroutine interface

Answer 9

The parts of a subroutine that are in direct contact with the calling program. This consists of the subroutine name, parameters and returned value(s)

Question 10

Why local variables are a good practice

Answer 10

If a value is only needed within a subroutine then it is good practice to make it a local variable. This reduces the total number of variables outside the subroutine and makes the program clearer.

Question 11

Difference between global and local variables

Answer 11

Global variables can be accessed and changed anywhere in the program whereas local variables can only be accessed or changed inside their subroutine