Variables & Values

Assignment

count = 10
price = 2.5
name = 'Lumen'

There are no declarations: the first assignment creates the variable. Names start with a letter or _ and continue with letters, digits or _. Keywords cannot be used as names. Names starting with @ are reserved for the compiler.

Types

A variable’s type is whatever it was last assigned; it can change freely:

x = 5
x = 'five'

Reading a variable that was never assigned gives the integer 0.

Float literals

A number containing a . is a float. 3.0 is a float; 3 is an integer. Arithmetic between an integer and a float produces a float. See Operators.

Everything is global

All variables live in one global scope. Routine and function parameters and any variable assigned inside a routine are ordinary globals too, see Routines & Functions.

Limits

Variables, arrays, string literals and numeric constants are each addressed by a single byte in the bytecode, so one program can use at most 256 of each. Exceeding this is not detected by the compiler. Each repeat nesting level also uses one hidden counter variable, named @cnt_<n>_<depth>.

Printing values

println prints integers as they are and floats with up to six significant digits (3.5, 0.333333, 3 for 3.0). Joining a float into a string with .. uses six decimals (2.500000).