382
The
VIC
20
User
Guide
Example:
?TAN(3.2)
XY(1)=TAN(180*_/180)
TI,
TI$
Displays 0.0584738547
TI and TI$ represent two system time variables.
Format:
TI Number
of
jiffies since current startup
TI$ Time
of
day string
Example:
?TI
TIf"'1081000"
USR
USR
is
a system function
that
passes a parameter to a user-written
assembly language subroutine whose address
is
contained in memory loca-
tions I and
2.
USR also fetches a return parameter from the subroutine.
Format:
USR(arg)
VAL
V AL returns the numeric equivalent
of
the string argument.
Format:
VAL(data$)
The number returned by VAL may be used in arithmetic computations.
V AL converts the string argument by first discarding any leading
blanks.
If
the first nonblank character
is
not
a numeric digit (0-9), the
argument
is
returned as a value
of
o.
If
the first non blank
is
a digit, VAL
begins converting the string into real number format.
If
it subsequently
encounters a nondigit character, it stops processing so that the argument
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