LearnITWithMrC

Subroutines 1 - Procedures

Lesson Video

28

Lesson Tasks

Watch the Lesson video
Make notes if needed.
Open your Learning Journal
Complete Task 1 in your Learning Journal
Complete the learning activities
Make sure you complete the book tasks in your Unit Booklet
Complete End of Task Assessment
Update your learning objectives

What do I need to Learn?

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I need to learn how to understand the concept of subroutines.

I need to learn how to explain the advantages of using subroutines in programs.

I need to learn how to describe the use of parameters to pass data within programs.

Key Terms

Procedure Subroutines Identifier Parameters local variable global variable scope

Task 1 - Getting organised Click to see more

Task: Learning Journal

Open your Learning Journal by clicking on the image below

Good notes will help you organise and process data and information

Task 1: Fill out your learning Journal.

Open your Learning Journal and complete the task below .

Task 2 - Introducing Subroutines Click to see more

Key word - Subroutine

A Subroutine is a reusable sequence of instructions that perform a specific task

In computer science, a Subroutine is a programming structure that can be used over and over again.

Subroutines are sequences of instructions that perform a specific task. It may return one or more values, but does not have to. It may be easier to think of them as mini-programs within a large program.

We are going to look at a simple Subroutine that prints a greeting.

Task: A simple Subroutine

Open Python Thonny

Save your file as 'a simple subroutine'

Copy the code from the image above and run it.

Then choose one of the three challenges below to complete.

Can you put a loop in your simple Subroutine so it prints out your greeting 3 times
Change the Subroutine so it asks the user a question then prints out a response
Change the Subroutine so that it repeatedly asks the user a question until it gets a specific answer.

When you are finished screenshot your code into your Learning Journal

Task 3 - Subroutines with parameters Click to see more

Key word - Parameter

A Parameter is a variable that is 'passed' to a subroutine

We can pass information to our procedure through parameters.

The terms parameter and argument are sometimes used interchangeably. However, parameter refers to the type and identifier, and arguments are the values passed to the function.

Below you can see our procedure has a single parameter called 'name' which we use to say hello to a person.

Run the code above with the three different arguments and see what happens

Task: Using Parameters

Open Python Thonny

Save your file as 'a simple subroutine2'

Copy the code from the image above and run it.

Then try the challenges below.

Change the Subroutine so it gets the username from an input and then prints the name
Add a second parameter to our Subroutine called age and then print out both the username and age.

When you are finished screenshot your code into your Learning Journal

Task 4 - Describe Explain Click to see more

Task: Review

Open your PowerPoint at Task 4

Complete the Describe and explain task above

Then try the extension task below

Create a subroutine using pseudocode to complete the following task

Ask a USER to input two numbers
Passes those numbers to a subroutine called add
Displays the sum of those two numbers to the screen

Write your answer in the extension slide (see below)

Task 5 - Lesson Review/Homework Click to see more

Summing it all up

Lets look at the learning outcomes and decide which one best describes our current level of understanding :

Tick the one you feel is closest to your level

Learning Outcomes

I have a basic understanding of how with a little help from my teacher
I can show my teacher that without their help.
independently and I can also explain it to others and can complete any extension tasks I am given.