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Pre-exam revision - flow
Subroutines
You may be given a question that asks you to utilise a pre-existing sub routine, if so this is the symbol!
Decisions
Decisions are made using the diamond i.e. an IF statement or loop
Start/End
✳✱*
Action/Process
Whenever you do something with the data you use the rectangle i.e. multiplying two numbers
ALWAYS use this symbol at the start and end of any diagram
Input/Output
Any time you ask for data, or display (print) it, you use the parallelogram
You will normally get marks even if this is the only thing you do!
Make a flow diagram
Take your swimming pool pseudocode and turn it into flow
Flow
Sometimes in your exam the question will give you the option of using either pseudo or flow
Other questions WILL tell you to create a flow diagram
Let's remind ourselves of the symbols used in flow diagrams
Lesson Objectives
To understand the symbols used when creating flow diagrams
To become more comfortable in creating flow diagrams for a given problem
Revise, Recap, Review
3 security measures that could be implemented to prevent un-authorised access to a network
2 types of switching to used to send data
1 explanation why adding more RAM won't always increase performance
Pre-exam revision - flow
Problem
The volume of a swimming pool can be calculated by using the following formula:
Volume = Length x Width x Depth
Write the pseudocode solution to calculate volume
Challenge
Hex() is a function that accepts a decimal number between 0 and 15 and returns the corresponding hexadecimal value
Task
Create a flow diagram that accepts a number between 0-255 and returns the hexadecimal equivalent. I.E an input of 255 would return the value FF