This document discusses different methods for representing algorithms, including structured English, flowcharts, and pseudo code. It focuses on pseudo code, explaining that pseudo code uses keywords and meaningful identifiers to represent the logical steps of an algorithm. The document provides examples of how to write simple algorithms using pseudo code, including input/output statements, operators, if/case statements, loops, and an example algorithm to calculate an average.

1. 1
Algorithm and Designs
Structured English
Flow charts
Pseudo code

2. 2
Structured English
 This is a method of showing the
logical steps in an algorithm, using
an agreed subset of straightforward
English words.

3. 3
Flowcharts
 A way of making an algorithm
using a set of symbols linked
together with flow lines, the steps
required for a task and the order
in which they are to be performed.

4. 4
Pseudo code
 This is a method of showing
detailed logical steps in an
algorith, using
keywords, identifiers with
meaningful names and
mathematical operators to
represent a solution.

5. 5
Writing simple algorithms using pseudo code
▲Note: Each line of pseudo code is usually a single step in an algorithm.

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Writing simple algorithms using pseudo code
 Input and Output

7. 7
Writing simple algorithms using pseudo code
 Operators used in pseudo code assignment statements:

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Writing simple algorithms using pseudo code
 If and Case statements

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Writing simple algorithms using pseudo code
 If and Case statements

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Writing simple algorithms using pseudo code
 Relational operators used in pseudo code selection statements:

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Writing simple algorithms using pseudo code
 To perform iteration using FOR, REPEAT–UNTIL and WHILE loops:
▲Note: A FOR loop has a fixed number of repeats, the STEP increment is an optional
expression that must be a whole number.

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Writing simple algorithms using pseudo code
 Repeat statement:
▲Note: Statements in a REPEAT loop are always executed at least once.

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Writing simple algorithms using pseudo code
 While loop:
▲Note: Statements in a WHILE loop may sometimes not be executed.

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Writing simple algorithms using pseudo code
 Example: An algorithm to find the average of a number of integers input

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Writing simple algorithms using pseudo code
 Identifier table for the algorithm: