Learning Objective To be able to… Understand flow chart symbols Complete and correct flow chart algorithms Create a program based on a flow chart.

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Presentation transcript:

Learning Objective To be able to… Understand flow chart symbols Complete and correct flow chart algorithms Create a program based on a flow chart

Symbols TERMINATOR PROCESS DECISION INPUT or OUTPUT

What do they do? TERMINATOR The terminator is the start and end of any program. The start symbol can only have one arrow leading away from it. This is ALWAYS a rounded rectangle.

What do they do? The process box is used when something happens, normally as a result of something in the program. This symbol can only have one arrow leading away from it, but can have more than one going into it. This is ALWAYS a rectangle. PROCESS

What do they do? The decision box is used when a question can be asked in a program, such as an IF…ELSE statement. This can have many arrows going into it, but only ever has TWO leaving – YES and NO (or TRUE and FALSE). This is ALWAYS a diamond. DECISION

What do they do? The I/O box is used when a question is asked to the user, or something is printed on the screen. This can have many arrows going into it, but only ever has one leaving. This is ALWAYS a parallelogram. INPUT or OUTPUT

Symbols TERMINATOR PROCESS DECISION INPUT or OUTPUT These symbols together create any program or set of instructions for any task. Let’s write one together on the whiteboard for making toast.

Now it’s your turn… TERMINATOR PROCESS DECISION INPUT or OUTPUT Use these symbols to create your own flowchart algorithm. Your flowchart must ask the user their age. If they are under the age of 3, tell them they’re a baby. If they are between 3 and 18, tell them they’re a child. If they’re over 18, call them an adult. If you’re finding that tough – just create a flowchart that calls them a baby or NOT a baby!

START If age < 3 How old are you? Print “Baby” If age < 18 Print “Child” Print “Adult” END Y Y N N This is just one method of completing the flow chart – there are many more! When you’ve completed your flow chart, have a go at creating it in Python!

What it could look like… Extend this program so that if the user enters nothing for the age, or if they enter a letter, they receive an error message.