LOWER$ Function

LOWER$(string-expression)

Converts a string expression to lower case, using standard ASCII case folding rules.

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Examples

PRINT LOWER$("HELLO")

Produces "hello".

PRINT LOWER$("RetroRocket 123!")

Produces "retrorocket 123!".

REM Normalise case for comparison
a$ = "Yes"
b$ = "YES"
IF LOWER$(a$) = LOWER$(b$) THEN
    PRINT "They match!"
ENDIF

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Notes

• Only affects ASCII letters A–Z (65–90), converting them to a–z (97–122).
• Non-alphabetic characters are unchanged.
• Useful for case-insensitive comparisons, normalisation, and text processing.

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See also: UPPER$ · LEN · MID$