ELSEIF - mkilgore/QB64pe GitHub Wiki
ELSEIF is used in an IF...THEN block statement to offer an alternative condition.
- ELSEIF statements require a separate code block line with THEN for each alternative condition.
- There can be more than one ELSE IF statement in a single-line IF statement.
- If there is only one possible alternative condition (such as 0 or NOT 0), use ELSE instead.
- If the comparisons are based on multiple conditions being true, it may require many ELSEIF comparisons. ELSE could help cover some of those conditions.
- You can use SELECT CASE when IF blocks have a long list of alterative ELSEIF conditions.
| Symbol | Condition | Example Usage |
|---|---|---|
| < | Less than | IF a < b THEN |
| > | Greater than | IF a > b THEN |
| = | Equal | IF a = b THEN |
| <= | Less than or equal | IF a <= b THEN |
| >= | Greater than or equal | IF a >= b THEN |
| <> | NOT equal | IF a <> b THEN |
Example 1: IF statement using ELSE IF in one statement line.
IF x = 100 THEN COLOR 10: PRINT x ELSE IF x > 100 THEN COLOR 12: PRINT x ELSE PRINT "< 100" |
Example 2: IF statement block
IF x = 100 THEN ' must place ANY code on next line! COLOR 10: PRINT x ELSEIF x > 100 THEN COLOR 12: PRINT x ELSE : PRINT "< 100" END IF |
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