UPPER$ Function

UPPER$(string-expression)

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

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Examples

PRINT UPPER$("hello")

Produces "HELLO".

PRINT UPPER$("Retro Rocket 123!")

Produces "RETRO ROCKET 123!".

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

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Notes

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

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See also: LOWER$ · LEN · MID$