Variables

We use variables to store data.
A variable has a name and a type.
We will write name: Type here, for example amount: Integer.

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Let's say we are calculating the total amount we spent on some items.
We can use 3 variables:

• amount: Integer
• price: Real
• total: Real

Before we use a variable, we must declare it.
Click the line and select Declare (Declare).
Then:

• select the added Declare block
• enter amount for variable name
• select Integer for its type
• enter 3 for its initial value

Do the same for price, set its type to Real and value to 1.5.

Declare total, set its type to Real and value to amount * price.

Lastly, add an Output block to print the value of total (total).

When you run the program you should see number 4.5 printed.

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As you can see, you can use variable name to refer to its value. Instead of repeating 3 in the program every time it is used, we just use amount.