Editing Action! (programming language) (section)

=== Data types ===
Action! has three fundamental [[data type]]s, all of which are numeric.

'''BYTE''' is internally represented as an [[signedness|unsigned]] 8-[[bit]] integer. Values range from 0 to 255.<br>
The CHAR keyword can also be used to declare BYTE variables.

  BYTE age=[21]      ; declare age and initialize it to the value 21
  BYTE leftMargin=82 ; declare leftMargin at address 82

'''CARD'''inal is internally represented as an [[signedness|unsigned]] 16-[[bit]] integer. Values range from 0 to 65,535.

  CARD population=$600             ; declare population and store it at address 1536 and 1537
  CARD prevYear, curYear, nextYear ; use commas to declare multiple variables

'''INT'''eger is internally represented as a [[signedness|signed]] 16-[[bit]] integer. Values range from -32,768 to 32,767.

  INT veryCold = [-10]
  INT profitsQ1, profitsQ2,  ; declaring multiple variables can 
      profitsQ3, profitsQ4   ; span across multiple lines

Action! also has ARRAYs, POINTERs and user-defined TYPEs. No [[floating point]] support is provided.

An example of a user-defined TYPE:

  TYPE CORD=[CARD x,y]
  CORD point
  point.x=42
  point.y=23