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RealityV15.1Online Documentation (MoTW) Revision 7
ALPHA Function (DataBasic) (m618703+alpha_f.htm)
Searches a string for alphabetic characters.
ALPHA(expression)
expression is any valid DataBasic expression or any string, substring, or value; expressed as a variable name, a value, or a string enclosed in quotes.
ALPHA returns a 1 (true) if expression is a string containing only upper and/or lower case alphabetic characters.
X = "123 WINDSOR AVE." IF ALPHA(X) THEN PRINT "OKAY" ELSE GO 99
Returns a 0, because string X contains numeric values. Control transfers to statement 99.
CITY = "London" IF ALPHA(CITY) THEN PRINT "ALL LETTERS" ELSE STOP
Returns a 1 and prints ALL LETTERS, because CITY contains only upper and lower case alphabetic characters.