====== IF ======

[pet] [vic20] [c64] [c16] [cplus4] [c128] [x16] [m65]

Conditional statements can be run using ''IF ... ELSE ... END IF'' blocks.

===== Single-line syntax =====

  IF <condition> THEN <statements> [ELSE <statements>]

===== Block syntax =====

  IF <condition> THEN
    <statements>
  [ELSE
    <statements>]
  END IF

The condition can be any expression that evaluates to a number. If the number is a nonzero value, the condition will pass, if it equals to zero, the condition will fail. Relations are expressions that evaluate to 0 if false, 255 if true:

  PRINT 1 > 0 : REM -- outputs 255
  
Therefore the condition can be any numeric expression:

  IF x > 0 AND x < 11 THEN PRINT "the number is between 1 and 10"