Software Design and Development (Design)

Structure Diagram Flowchart Pseudocode

Structure Diagrams are visual design techniques that show the steps we to solve a problem

Rectangle - Process Oval - Loop Hexagon - Selection Double Rectangle - Pre-Defined Function

Processes are the things simple tasks that the program must do eg. Calculations / Outputs etc.

Loops show that repetition is needed. There will be either Fixed or Conditional Loops here eg. a loop that will repeat an action 5 times

Selections are the different outcomes that are available eg. IF statements

Pre-Defined Functions are Round, Random and Length. Round will round a value, Random will return a random number, and Length will return a value that is the number of characters in a variable.

Structure Diagram

Arrow - Flow Lines Rounded Rectangle - Terminal Hexagon - Initialisation Parallelogram - Input/Output Kite - Decision Rectangle - Process Double Rectangle - Pre-Defined Function Circle - On-Page Connecter

Flow Lines are are used to show the directions of the symbols

Terminals show the start and end of a problem

Initialisations show the declaration of variables and arrays. They are also used to assign an initial value. eg. Putting 0 into a variable at the start

Inputs/Outputs show the data input or data output eg. A program asking for a value

Decisions show that a decision is to be made eg. IF statements

Processes are the things simple tasks that the program must do eg. Calculations / Outputs etc.

Pre-Defined Functions are Round, Random and Length. Round will round a value, Random will return a random number, and Length will return a value that is the number of characters in a variable.

On-Page Connecters are used if a flowchart goes on for a while and would other wise lead onto another page

Pseudocode is a written design notation which is unlike any programming language.