Pizza Robot – Flowchart

In this blog post we will design our own algorithms using both pseudo-code and flowcharts.

When given a problem to solve using a computer program you need to think about?

• What are the main steps required to solve this program? (decomposition)
• In which order will these steps be processed? (sequencing)
• What information do I need to retrieve from the end user? (inputs)
• What information do I need to display to the end user? (outputs)
• What decisions will the computer need to make? (selection / if statements)
• Is there any part of the process that can be repeated several times? (iteration / loops)

Then you can design your algorithm either in “plain English” (e.g. using pseudo-code) or using a visual representation (flowchart).

Scenario: Coffee Machine

Let’s look at the algorithm used in a tea/coffee machine.
The machine should:

• Ask the user whether they want tea or coffee,
• Add the tea or the coffee to the cup,
• Ask the user whether they want milk,
• If so, add milk to the cup,
• Ask the user whether they want sugar,
• If so, add sugar to the cup,
• Pour the hot water into the cup.

Now let’s look at this algorithm using pseudo-code and using a flowchart:

Pseudo-codeFlowchart

```START;

/Would you like Tea or Coffee?/;

if tea {
Add Tea in cup;
} else {
Add Coffee in cup;
}

/Would you like Milk?/;

if Milk {
Add Milk in cup;
}

/Would you like Sugar?/;

if Sugar {
Add Sugar in cup;
}

Pour hot water in cup;

END;```

Adapt the above algorithm to use it in a pizza robot. Here is what the robot should do:

• Welcome the user,
• Ask what pizza base they need? (Thin, Thick)
• Ask if they want tomato sauce or BBQ sauce?
• Ask if they want cheese or not?
• Cook the pizza for 20 minutes,
• Serve the pizza

Extension:

1. Ask if the user is vegetarian. If they are not, then ask if they want chicken on their pizza.
2. The cooking time of the pizza varies: It should be 15 minutes for a thin base and 20 minutes for a thick base. Adapt your flowchart accordingly.

Create your pseudo-code and your flowchart using code2flow.com. Note you can reuse the code form the coffee machine to help you get started!

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