QBasic 1.1: IF Keyword

Explanation

IF...THEN...ELSE Statement

Executes a statement or statement block depending on specified conditions.

Worth knowing

Useful and cross-version information about the programming environments of QBasic, QuickBasic and Visual Basic for DOS.

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Syntax

IF condition1 THEN
   [statementblock-1]
[ELSEIF condition2 THEN
   [statementblock-2]]...
[ELSE
   [statementblock-n]]
END IF
 
IF condition THEN statements [ELSE statements]

Description / Parameter(s)

condition1 condition2	Any expression that can be evaluated as true (nonzero) or false (zero).
statementblock-1 statementblock-2 statementblock-n	One or more statements on one or more lines.
statements	One or more statements, separated by colons.

Example


INPUT "1 or 2? ", i%
IF i% = 1 OR i% = 2 THEN
  PRINT "OK"
ELSE
  PRINT "Out of range"
END IF