This document discusses three types of program flow control: sequence, selection, and looping. It defines basic flowchart elements like start/stop, process, and decision. It provides examples of each type of flow control in a flowchart, including a sequential toasting process, a decision on whether to wear a coat based on the weather, and a looping process to buy a Freddo bar. The document aims to explain why people create flowcharts before starting a project - to plan and visualize the program flow and logic.

1. Program Flow Control 1

2. 3 Control Structures to consider
• Sequence (a, b, c, d)
• Selection (what do you want from a to d?)
• Looping (a, b, c, d, a, b, c, d, a, b, c, d)

3. Basic Elements
Start / Stop
Process
Decision

4. Basic Elements explained
• Start/Stop – used to begin and end the
flowchart
• Process – an operation which takes place,
usually contains a description
• Decision – makes a Boolean choice and has
two lines coming from it – yes/no

5. Flowcharts – Sequence
Start
Stop
Put bread in
toaster
Wait for bread
to toast
Eat toast

6. Flowcharts – Selection
Start
Stop
Is it
wet?
Wear a coat Wear shades
YES NO

7. Flowcharts – Looping
Start
Stop
Do I
have
20p
Buy a Freddo
Go home and
get wallet
YES
NO

8. Question
• Why do people create flowcharts before they
start a project?