Tandy color computer 8 basic Quick Reference Manual page 13

Functions
ABS
(n)
Returns the absolute value
of n.
A=ABS(B)
ASC
(string)
Returns
the
code
of
the
first
character
in string.
A=ASC(B$)
ATN
(n)
Returns the arctangent
of
n
in
radians.
A=ATN(B/3)
BUTTON
(n)
Returns
1
if
Joystick
Button n
is
being pressed;
if
Joystick Button n
is
not
being
pressed,
n can
be:
—
Right
joystick,
Button
1
(old joystick)
1
—
Right
joystick,
Button 2
2
—
Left joystick,
Button
1
(old joystick)
3
—
Left joystick,
Button 2
A=BUTTON(0)
CHR$
(n)
Returns
the character corresponding
to
character
code
n.
A$=CHR$(65)
COS
[angle)
Returns
the cosine
of
an angle
using radians.
A=COS(B)
EOF(cf)
Returns
FALSE
(0)
if
there
is
more
data;
TRUE
(-1)
if
end
of
file
has been
read.
d
Device number:
-1
Cassette
IF
E0F(-1)=-1 THEN
220
ERLIN
Returns
the
BASIC
line
number where an
error
has
occurred.
IF
ERLIN
=
110 THEN 200
ERNO
Returns
the
BASIC
error
number
for
the
error that
has
occurred.
IF
ERNO
= 20
THEN CLOSE
Functions
EXP
(n)
Returns a
natural exponential
number
(e
A
/7).
A=EXP(B*1
.15)
FIX
(n)
Returns the truncated
integer
of n.
Unlike
INT,
FIX
does
not return the next lower
number
for
a
negative
n.
A=FIX(B-.2)
HEX$
(n)
Returns a
string
with the
hexadecimal
value
of n.
PRINT HEX$CA)
;"
= ";
HPOINT
(x,y)
Returns information on
point x,y
from
the high-
resolution graphics screen:
Point
is
reset
Code
Point
is
set
IF
HPOINT(22,33>=0
THEN 200
INKEYS
Checks
the keyboard
and
returns
the key being
pressed
or,
if
no
key
is
being pressed,
returns
a
null string (" ").
A$=INKEY$
INSTR
(p,s
t
t)
Searches a
string.
Returns
location
of
a
target
string
in
a search
string.
p
Start
position
of
search
s String
being searched
t
Target string
A
=
INSTR
(1
,H5$,
"BEETS")
INT
(n)
Converts n
to
the largest integer that
is
less
than
or
equal
to n.
A=INT(B+.5)
JOYSTK
(/)
Returns the
horizontal or vertical
coordinate
(j)
of
the
left
or right joystick:
—
Horizontal, right joystick
1
—
Vertical, right joystick
2
—
Horizontal,
left
joystick
3
—
Vertical,
left
joystick
A=JOYSTK(0)
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