Variables

The wheel VM only uses one primitive data type: number.

Wheel supports three other data types: string, record, array and pointer.

These types are all based on the primitive number type.
A variable is declared by the type followed by the name of the variable.

Number type

A number variable can be used for integers and floating point values.

number n

String type

A string value is a number representing the index in a string list contained in the program file.

string n

Array

An array represents a list. Arrays can be declared by defining the size between brackets after the variable name. The size must a positive number of at least 1 or higher.

number n[10]

Record

A record is a representation of a group of variables.

record Point
    number x
    number y
endr

Point p

proc main()
    p.x = 10
    p.y = 5
end

Global scope

When a variable is declared outside of a procedure then it's accessible in the entire scope of the program after the declaration.

#project "Global variable demo"

number n

proc main()
    n = 10
end

Local scope

A variable declared inside a procedure can only be accesed inside that procedure.

#project "Local variable demo"

proc main()
    number n
    n = 10
end

Parameter variables

All procedures except the main procedure can have one or more parameters.

#project "Parameter demo"

proc first(number n)
end

proc second(number i, number j)
end

proc main()
    first(15)
    second(17, 18)
end