Table of Contents

IF

PET VIC-20 C64 C16 Plus/4 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"