Download - True BASIC

424 True BASIC Language System
CHARUNION$ Function
Library:
Syntax:
Usage:
Summary:
Details:
Example:
Exceptions:
See also:
CONTROL$ Function
Library:
Syntax:
Usage:
Summary:
Details:
Example:
Exceptions:
See also:
DELCHAR$ Function
Library:
Syntax:
Usage:
Summary:
Details:
STRLIB.TRC
CHARUNION$ (strex, strex)
LET union$ = CHARUNION$ (a$, b$)
Returns the set of characters contained within the values of either a$ or b$.
The CHARUNION$ function returns a string containing the union of the sets of characters
represented by the values of its arguments a$ and b$.
That is, the CHARUNION$ function returns a string which contains one of each character
which appears in the value of either of its arguments. The characters will be organized
within the resulting string in ascending order by their ASCII codes. Thus, uppercase letters
will be listed before all lowercase letters.
The following program:
LIBRARY "StrLib.trc"
DECLARE DEF CharUnion$
LET a$ = "Now is the time"
LET b$ = "for all good men"
PRINT CharUnion$ (a$, b$)
END
produces the following output:
Nadefghilmnorstw
(Note: there is a space before the 'N'.)
None
CHARINT$, CHARDIFF$, CHARS$, UNIQ$
STRLIB.TRC
CONTROL$
LET set$ = CONTROL$
Returns the set of control characters.
The CONTROL$ function returns a string containing the set of control characters,
arranged in ascending order according to their ASCII codes. (For a table of the ASCII codes
and their corresponding characters, see Appendix A.)
That is, it returns a string composed of those characters with ASCII codes between 0 and 31,
inclusive.
None.
None
DIGITS$, LETTERS$, ALPHANUM$, UPPER$, LOWER$, PUNCT$
STRLIB.TRC
DELCHAR$ (strex, strex)
LET a$ = DELCHAR$ (text$, oldchars$)
Returns the value of text$ with all characters appearing in oldchars$ removed.
The DELCHAR$ function removes from text$ all characters which are members of the
character set represented by the value of oldchars$. That is, it returns the value of
text$ after having deleted any occurrences of characters appearing in the value of
oldchars$.