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
.
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
( ).
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.
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
.