The IF statement evaluates a conditional expression and transfers  program
  control, depending on the resulting value.

  Examples

  IF A > 0
    THEN PRINT A
    ELSE PRINT "A IS NOT GREATER THAN 0"
  END IF
  PRINT A IF A > 0

1  –  Syntax

  Conditional:

      IF cond-exp THEN  {statement} [ELSE {statement...}] [END IF]

  Statement Modifier:

      statement IF cond-exp