Commodore VIC-20 Programmer's Reference Manual page 58

EXAMPLE:
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10 XS = "TEST"
20 PRINT ASC(XS)
RUN
84
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See the CHRS function for ASCII-to-string conversion.
ATN
Format: Abbreviation: Screen Display:
ATN(X) A JP|Jt a \D
Action: Returns the arctangent of X in radians. Result \s in the
range — pi/2 to pi/2. The expression X may be any numeric type, but
the evaluation of ATN is always performed \n floating point binary.
EXAMPLE:
10 INPUT X
20 PRfNT ATN(X)
RUN
?3
1.24904577
READY.
CHR$
Format: Abbreviation: Screen Display:
CHR$(I) cBBBIh C ( I
Action: Returns a string whose one element has ASCII code L
(ASCH codes are listed in Appendix F.) CHR$ is commonly used to
send a special character to the terminal. For instance, a screen
clear could be sent (CHR$(147)} to clear the CRT screen and return
the cursor to the home position, as a preface 1o an error message.
EXAMPLE:
PRINT CHRS(66)
B
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