NB: More recent documentation for Dyalog APL is available at https://docs.dyalog.com/20.0/.

Statements

A statement is a line of characters understood by APL.  It may be composed of:

1. a LABEL (which must be followed by a colon :), or a CONTROL STATEMENT (which is preceded by a colon), or both,
2. an EXPRESSION (see Expressions),
3. a SEPARATOR (consisting of the diamond character ⋄ which must separate adjacent expressions),
4. a COMMENT (which must start with the character ⍝).

Each of the four parts is optional, but if present they must occur in the given order except that successive expressions must be separated by ⋄. Any characters occurring to the right of the first comment symbol (⍝) that is not within quotes is a comment.

Comments are not executed by APL. Expressions in a line separated by ⋄ are taken in left-to-right order as they occur in the line. For output display purposes, each separated expression is treated as a separate statement.

Examples

      5×10
50
 
      MULT: 5×10
50
 
      MULT: 5×10 ⋄ 2×4
50
8
 
      MULT: 5×10 ⋄ 2×4  ⍝ MULTIPLICATION
50
8