10n2

Learning Objective: Understand what an algorithm is and how to represent them when planning.
Starter:
Exam Marks..
Q4

 Main:
Algorithms 
BBC Bitesize
"An algorithm is a set of instructions that describes how to get something done. Algorithms can be designed using pseudocode and flow charts. They are written using statements and expressions"

Algorithms are sets of step-by-step instructions that if followed exactly will perform a specific task.

 Flowcharts
Tea Algorithm?
Pass the Parcel?
Anything else?

 Pseudocode
Common pseudocode notation

There is no strict set of standard notations for pseudocode, but some of the most widely recognised are:

INPUT – indicates a user will be inputting something
OUTPUT – indicates that an output will appear on the screen
WHILE – a loop (iteration that has a condition at the beginning)
FOR – a counting loop (iteration)
REPEAT – UNTIL – a loop (iteration) that has a condition at the end
IF – THEN – ELSE – a decision (selection) in which a choice is made

Any instructions that occur inside a selection or iteration are usually indented

Pseudocode can be used to plan out programs. Planning a program that asks people what the best subject they take is, would look like this in pseudocode:
REPEAT
              OUTPUT 'What is the best subject you take?'
              INPUT user inputs the best subject they take
              STORE the user's input in the answer variable
              IF answer = 'Computer Science' THEN
                             OUTPUT 'Of course it is!'
              ELSE
                             OUTPUT 'Try again!'

UNTIL answer = 'Computer Science'



Challenge: Try the tasks on the sheets

 Plenary:
Q10/11/12



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