Commodore Plus 4 - Page 168

EXAMPLE
PRINT INSTR('THE CAT IN THE HAT", 'CAT")
the result is 5, because CAT starts at the fifth character in string 1 —
INT(X) (integer)
Returns the integer portion of X, with all decimal places to the right of —
the decimal point removed. The result is always less-than or equal to X.
Thus, any negative numbers with decimal places become the integer ,
less-than their current value (e.g. INT(-4.5)= -5).
If the INT function is to be used for rounding up or down, the form is —>
INT(X+/- .5),
_
EXAMPLE.
X=IMT(X*100 + .5)/100 _
Rounds to the next highest penny. —■
JOY (n) _
When n = 1 Position of joystick #1
n = 2 Position of joystick # 2 *—■
Any value of 128 or more means the fire button is also depressed. The
direction is indicated as follows —
UP _
fire = 128+ 1
8 2
LEFT 7 0 3 RIGHT ~
6 4
5
—
DOWN
u
EXAMPLE
JOY(2)=135 __
joystick #2 fires to the left
LOG(X) (logarithm) ~~
This returns the natural log of X. The natural log is log to the base e
(see EXP(X)). To convert to log base 10, divide by LOG( 10). —