ELSE Keyword

IF expression THEN statement ELSE statement
 
IF expression THEN
    statements
ENDIF
 
IF expression THEN
    statements
ELSE
    statements
ENDIF

ELSE provides the false branch of an IF decision.
When the expression evaluates to true, the THEN part runs; otherwise the ELSE part runs.

Remarks

ELSE is used with IF and, in multi-line forms, must be paired with a matching ENDIF.

ELSE on its own is not a valid statement.

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Forms

• Single-line
  IF expression THEN statement ELSE statement
  Both the THEN and ELSE parts must be single statements on the same line.
• Multi-line without ELSE
  

  IF expression THEN
      statements
  ENDIF

  The statements run only if expression is true.
• Multi-line with ELSE
  

  IF expression THEN
      statements-when-true
  ELSE
      statements-when-false
  ENDIF

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Examples

Single-line selection

PRINT IF X > 0 THEN "POSITIVE" ELSE "NON-POSITIVE"

Multi-line with ELSE

IF SCORE >= 100 THEN
    PRINT "WELL DONE!"
ELSE
    PRINT "KEEP GOING..."
ENDIF

Nested IF/ELSE

IF A > B THEN
    PRINT "A > B"
ELSE
    IF A = B THEN
        PRINT "A = B"
    ELSE
        PRINT "A < B"
    ENDIF
ENDIF

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Rules & behaviour

• Pairing: In multi-line form, ELSE pairs with the nearest unmatched IF. Always terminate the block with ENDIF.
• Single statement on one line: The one-line form allows exactly one statement after THEN and one after ELSE. To perform multiple actions, use the multi-line form.
• Nesting: IF … THEN … ELSE … ENDIF blocks may be nested freely.
• Whitespace: Keywords may be separated by spaces as shown; keep them on their own lines in multi-line form for clarity.

See also: IF, ENDIF